Excretory Cloze Activity Worksheets - Free Printable

Let’s go through the worksheet step by step. It’s about the excretory system — that’s the body’s way of getting rid of waste and extra water.

We’ll fill in each blank using the word bank at the bottom. The words are numbered, so we can match them to the blanks.

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First sentence:
“The main ______ of the excretory system which is also called the urinary system, are the two kidneys, the ______ and the two ______.”

Looking at the context:
- “main” → probably “organs” (word #4)
- After kidneys, it says “the ______ and the two ______” → likely “ureters” and “kidneys” but wait — kidneys are already mentioned. Let’s read carefully.

Actually, standard anatomy: excretory/urinary system includes:
→ 2 kidneys
→ 2 ureters
→ 1 bladder
→ 1 urethra

But the sentence says: “the two kidneys, the ______ and the two ______”

Wait — maybe it’s “the two kidneys, the bladder, and the two ureters”? But that doesn’t fit grammatically because “the two ______” would be plural.

Looking at word bank:
#7 = ureters
#12 = bladder
#4 = organs

So first blank: “The main organs” → #4
Then: “are the two kidneys, the bladder and the two ureters” → #12 and #7

Yes, that makes sense.

Next:
“Kidneys receive large amounts of ______ (which contains lots of ______) pumped by the heart...”

Blood goes to kidneys → blood contains waste → so:

“large amounts of blood” (#1)
“contains lots of waste” (#5)

Next:
“The kidney’s main function is to filter excess un-needed fluids and substances from the blood and excrete them into ______.”

Excrete into what? Urine → but urine isn’t in word bank. Wait — look: #9 = urine? No, #9 is “blood” — no, #1 is blood.

Wait word bank again:

1. blood
2. salt
3. storage
4. organs
5. waste
6. water
7. ureters
8. human
9. blood ← duplicate? Probably typo. Maybe #9 is “urine”? But it says “blood”. Hmm.

Wait — let’s check original image text if possible... but since I can’t, I’ll use logic.

After filtering, kidneys make urine → urine goes into ureters → then bladder.

But the sentence says: “excrete them into ______”

Probably “urine” — but not in list? Wait — #9 is listed as “blood” — that must be a mistake. Or perhaps #9 is meant to be “urine”? Let’s see later clues.

Actually, looking ahead: “eliminate liquid ______ passes through the kidneys...” → that’s probably “urine” or “water”.

Wait — next part: “If you drink too many fluids, the kidney will quickly make extra urine from the ______.”

That should be “water” → #6

Then: “The excretory or the urinary system excretes liquids and salts. The kidneys are making urine all the time while they ______ and eliminate liquid ______ , passes through the kidneys about 300 times a day.”

This is messy. Let’s parse:

“while they ______ and eliminate liquid ______”

Probably: “while they filter and eliminate liquid waste” — but “filter” not in word bank.

Word bank has: #10 = filter → yes!

And “liquid waste” → #5 is waste, but maybe “water”? #6 is water.

Wait — “eliminate liquid ______” — could be “water” or “waste”.

But earlier it said “excretes liquids and salts” — so liquids = water, salts = salt.

Also: “passes through the kidneys about 300 times a day” — that’s referring to blood! Blood circulates and gets filtered many times.

So: “eliminate liquid waste, blood passes through...” — but that doesn’t flow well.

Perhaps: “while they filter and eliminate liquid waste. Blood passes through...”

Yes — that fits.

So:
Blank: “while they filter” (#10)
“eliminate liquid waste” (#5)
Then new sentence: “Blood passes through the kidneys about 300 times a day.” (#1 or #9 — both say blood, pick #1)

Next:
“The kidneys also make sure the body has just the right amount of ______ . If waste doesn't get eliminated, then our bodies would be full of toxins.”

Right amount of what? Water → #6

Because kidneys regulate water balance.

Next:
“The reason that urine is waste is because there are many substances in the blood that the body cannot use and if these substances were allowed to accumulate in the bloodstream, the body could become ______ .”

Become sick → #15

Next:
“The remarkable kidneys remove their undesirable substances from the blood and make them into urine for excretion. As the kidneys work hard to make urine constantly, the bladder acts as the ______ . Tank but when the bladder gets full, the need to urinate occurs.”

Bladder acts as the storage tank → #3

Next:
“Like the urine, the excretory system sounds similar to the digestive system both ridding the body of waste. However, the digestive system rids the body of foods and drink once the nutrients have been extracted from it through the digestive system and onto solid waste. Whereas, the excretory / urinary system excretes the by-products of ______ functioning.”

By-products of human functioning? Or body? Word bank has #8 = human

Probably “human” — as in human body functions.

Now let’s compile all answers in order.

List of blanks in order:

1. The main ______ → organs (#4)
2. the two kidneys, the ______ → bladder (#12)
3. and the two ______ → ureters (#7)
4. receive large amounts of ______ → blood (#1)
5. which contains lots of ______ → waste (#5)
6. excrete them into ______ → ? Not clear yet. Maybe urine? But not in bank. Wait — perhaps “ureters”? But that’s where urine goes after kidney.

Actually, re-read: “filter excess... from the blood and excrete them into ______”

In biology, kidneys excrete waste into urine, which then goes to ureters. But the blank might be “urine” — but not in word bank. Unless #9 is meant to be urine? But it says “blood”.

Wait — look at word bank again as given:

1. blood
2. salt
3. storage
4. organs
5. waste
6. water
7. ureters
8. human
9. blood ← duplicate?
10. filter
11. fluids
12. bladder
13. urine ← ah! Here it is! #13 = urine
14. abdomen
15. sick

I missed #13 = urine earlier. Sorry!

So #13 = urine

So blank 6: “excrete them into urine” (#13)

Then next: “If you drink too many fluids, the kidney will quickly make extra urine from the ______.” → water (#6)

Then: “The excretory or the urinary system excretes liquids and salts. The kidneys are making urine all the time while they ______ and eliminate liquid ______ , passes through the kidneys about 300 times a day.”

So:
while they filter (#10)
eliminate liquid waste (#5)
then “blood passes through...” (#1 or #9 — use #1)

But the comma before “passes” suggests it’s connected: “eliminate liquid waste, [and] blood passes...” — so yes.

Next: “make sure the body has just the right amount of ______” → water (#6) — but we already used #6? Can we reuse? Probably not — each word used once.

Problem: water is needed twice? Let’s see.

Earlier: “make extra urine from the ______” → water (#6)
Then: “right amount of ______” → also water? But only one #6.

Perhaps “salt”? But kidneys regulate water more directly.

Wait — word bank has #2 = salt, #6 = water, #11 = fluids

“fluids” might work for the second one.

But typically, it’s water balance.

Perhaps the first one is “fluids” (#11), second is “water” (#6)

Let’s try:

“make extra urine from the fluids” (#11)
“right amount of water” (#6)

Yes, that works.

Then: “body could become ______” → sick (#15)

“bladder acts as the ______” → storage (#3)

“by-products of ______ functioning” → human (#8)

Now let’s list all blanks in sequence with numbers:

From start:

1. organs → #4
2. bladder → #12
3. ureters → #7
4. blood → #1
5. waste → #5
6. urine → #13
7. fluids → #11 (for "make extra urine from the fluids")
8. filter → #10
9. waste → #5? But already used. Problem.

Wait, blank 9 is “eliminate liquid ______” — if we used waste for #5, can’t reuse.

Perhaps “eliminate liquid water”? But water is #6, and we plan to use for “right amount of water”.

Alternative: maybe “eliminate liquid salts”? But salts is #2.

Let’s rethink.

Standard knowledge: kidneys filter blood, remove waste and excess water, produce urine.

In the sentence: “excretes liquids and salts” — so liquids = water, salts = salt.

Then: “making urine all the time while they ______ and eliminate liquid ______”

“eliminate liquid waste” — waste includes dissolved salts and urea, etc.

But word “waste” is #5, and we used it for “contains lots of waste” — that’s fine, but can we use same word twice? The worksheet probably expects each word used once, since it’s a matching exercise.

Count the blanks.

Let me count how many blanks there are.

From the text:

- Blank 1: main ______
- Blank 2: the ______ (after kidneys)
- Blank 3: the two ______
- Blank 4: amounts of ______
- Blank 5: lots of ______
- Blank 6: into ______
- Blank 7: from the ______ (make urine from)
- Blank 8: while they ______
- Blank 9: liquid ______
- Blank 10: ______ passes through (this is a new sentence, so blank 10)
- Blank 11: amount of ______
- Blank 12: become ______
- Blank 13: acts as the ______
- Blank 14: of ______ functioning

That’s 14 blanks.

Word bank has 15 words, so one unused.

Words: 1.blood, 2.salt, 3.storage, 4.organs, 5.waste, 6.water, 7.ureters, 8.human, 9.blood(dup?), 10.filter, 11.fluids, 12.bladder, 13.urine, 14.abdomen, 15.sick

#9 is blood again — probably a typo, should be something else, but we'll ignore duplicate.

Now assign:

1. organs - #4
2. bladder - #12
3. ureters - #7
4. blood - #1
5. waste - #5
6. urine - #13
7. fluids - #11 (make urine from fluids)
8. filter - #10
9. water - #6 (eliminate liquid water? But usually it's waste. However, "liquids and salts" were mentioned, so liquids could be water)
But earlier it said "excretes liquids and salts", so eliminating liquid water makes sense.

Then: "______ passes through" - this should be blood - #9 (since #1 used)
Or #1 is used, so #9 blood.

Then: "amount of ______" - water is used, so perhaps salt? But kidneys regulate water primarily.

"right amount of water" is key, but if water is used for blank 9, then for blank 11, what?

Perhaps blank 9 is "waste", but waste is used for blank 5.

Another idea: blank 5 is "waste", blank 9 is "salts" - #2

Because it says "excretes liquids and salts", so eliminate liquid salts? But salts are not liquid; they are dissolved.

Perhaps "eliminate liquid waste" and accept that "waste" is used twice, but unlikely.

Let's look at the sentence: "eliminate liquid ______ , passes through the kidneys"

The comma suggests that "passes through" refers to the same thing, so "liquid waste passes through" — but waste doesn't pass through; blood does.

I think there's a punctuation issue. Probably it's: "eliminate liquid waste. Blood passes through..."

So blank 9 is "waste", and blank 10 is "blood".

But waste is already used for blank 5.

Unless blank 5 is not waste.

Blank 5: "contains lots of ______" — in blood, it's waste products, so waste is correct.

Perhaps for blank 9, it's "water", and for blank 11, "salt" or "fluids".

Let's try this assignment:

1. #4 organs
2. #12 bladder
3. #7 ureters
4. #1 blood
5. #5 waste
6. #13 urine
7. #11 fluids (make urine from fluids)
8. #10 filter
9. #6 water (eliminate liquid water)
10. #9 blood (blood passes through) — using the duplicate blood
11. #2 salt (right amount of salt) — kidneys do regulate salt too
12. #15 sick
13. #3 storage
14. #8 human

Then unused words: #14 abdomen, and #5 waste is used, #6 water used, etc.

#5 waste is used for blank 5, #6 water for blank 9, #2 salt for blank 11.

Is "right amount of salt" accurate? Kidneys regulate both water and salt, but the sentence says "make sure the body has just the right amount of ______" — in context, after talking about toxins and waste, it might be water, but salt is also regulated.

Perhaps "fluids" for blank 11, but fluids is used for blank 7.

Another possibility: blank 7 is "water", blank 11 is "fluids".

Let's swap:

7. #6 water (make urine from water)
11. #11 fluids (right amount of fluids)

That might work.

And for blank 9: "eliminate liquid waste" — but waste is used.

Unless we use "salts" for blank 9.

Blank 9: "eliminate liquid salts" — not ideal, but possible.

Or perhaps "eliminate liquid waste" and use waste for blank 9, and for blank 5, use something else.

Blank 5: "contains lots of ______" — in blood, it's waste, but could be "toxins" — not in bank.

I think the intended answer is:

For blank 9: waste
For blank 5: waste — but that would require using waste twice, which is not typical for such worksheets.

Perhaps the word bank allows reuse, but usually not.

Let's count the number of times "waste" appears in the text — only in blank 5 and possibly blank 9.

Another idea: in blank 9, it's "waste", and in blank 5, it's "toxins" — but not in bank.

I recall that in some versions, the word bank has "waste" only once, and for blank 9, it's "water".

Let's assume that "eliminate liquid water" is acceptable, as water is a liquid waste product in a way.

So final decision:

Blanks in order:

1. organs - #4
2. bladder - #12
3. ureters - #7
4. blood - #1
5. waste - #5
6. urine - #13
7. fluids - #11 (make urine from fluids)
8. filter - #10
9. water - #6 (eliminate liquid water)
10. blood - #9 (blood passes through) — using the second blood entry
11. salt - #2 (right amount of salt) — or water, but water is used
12. sick - #15
13. storage - #3
14. human - #8

Unused: #14 abdomen

And #5 waste is used once, #6 water once, etc.

For blank 11, "right amount of water" is more accurate, but if water is used for blank 9, then salt is okay.

Perhaps blank 9 is "waste", and blank 5 is "impurities" — not in bank.

I think for educational purposes, we'll go with:

After research and standard knowledge, the most logical fill-ins are:

- The main organs (#4)
- the bladder (#12)
- the two ureters (#7)
- amounts of blood (#1)
- lots of waste (#5)
- into urine (#13)
- from the water (#6) [make urine from water]
- while they filter (#10)
- eliminate liquid waste (#5) — but conflict

To resolve, perhaps the worksheet intends "waste" for blank 5, and for blank 9, "salts" or "water".

Let's look online or recall: in many textbooks, it's "eliminate waste products".

But for the sake of completing, I'll use:

Blank 9: waste — and assume that "waste" can be used, or perhaps it's a different word.

Another thought: in the word bank, #5 is "waste", and it's only used once, so for blank 9, it must be something else.

Let's read the sentence: "eliminate liquid ______ , passes through the kidneys"

If we put "waste", then "liquid waste passes through" — but liquid waste is urine, and urine doesn't pass through the kidneys; it is produced by them. Blood passes through.

So likely, it's "blood passes through", so blank 10 is "blood", and blank 9 is "waste", with a period or something.

In the text, it's "eliminate liquid ______ , passes through" — the comma might be a typo, and it should be "eliminate liquid waste. Blood passes through..."

So blank 9: waste (#5) — but already used for blank 5.

Unless blank 5 is not waste.

Blank 5: "contains lots of ______" — in blood, it's waste, but could be "minerals" — not in bank.

I think the best is to use "waste" for blank 5, and for blank 9, use "water", and for blank 11, use "salt".

So:

5. waste - #5
9. water - #6
11. salt - #2

And for blank 7: "make extra urine from the fluids" #11

Then blank 10: "blood" #9

So the sequence of answers is:

4, 12, 7, 1, 5, 13, 11, 10, 6, 9, 2, 15, 3, 8

Let's write them out:

1. #4 organs
2. #12 bladder
3. #7 ureters
4. #1 blood
5. #5 waste
6. #13 urine
7. #11 fluids
8. #10 filter
9. #6 water
10. #9 blood
11. #2 salt
12. #15 sick
13. #3 storage
14. #8 human

Unused: #14 abdomen

This seems reasonable.

So the final answer is the sequence of numbers for the blanks in order.

Final Answer:
4, 12, 7, 1, 5, 13, 11, 10, 6, 9, 2, 15, 3, 8