Body Systems and Organs Graphic Organizer - Free Printable

Let’s go step by step to fill in the blanks based on how body systems connect and function.

We’ll start from known facts and work outward:

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1. Nervous system includes spinal cord → what else?
The nervous system includes the brain and spinal cord. So blank #1 = brain

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2. Integumentary system functions to protect tissues → what else?
Integumentary (skin, hair, nails) also helps with temperature regulation or sensation. But looking at the diagram, it points to “protect tissues” and another box (#2). Since sweat glands are listed under integumentary, and they help cool the body, #2 is likely regulate temperature

But wait — let’s check standard curriculum: Integumentary system functions include:
- Protects internal organs
- Regulates body temperature
- Sensation
- Excretion (via sweat)

Since “protect tissues” is already given, and sweat glands are shown separately, #2 is probably regulate temperature

→ Blank #2 = regulate temperature

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3. Integumentary includes → sweat glands and ???
Skin has sweat glands, sebaceous (oil) glands, hair follicles, etc. The most common pairing in diagrams like this is sebaceous glands or just glands, but since “sweat glands” is specified, the other major one is sebaceous glands. However, sometimes it’s simplified to “hair” or “nails”.

Wait — look at the arrow: “includes” goes from Integumentary to two boxes: one is “sweat glands”, the other is #3. In many middle/high school diagrams, they pair sweat glands with sebaceous glands. But if we’re keeping it simple, maybe it’s hair? Or nails?

Actually, let’s think differently. The integumentary system includes skin, hair, nails, and glands. Since “sweat glands” is one gland type, the other major gland type is sebaceous glands. But perhaps the diagram expects sebaceous glands.

However, I recall that in some curricula, they list “sweat glands” and “oil glands” — oil glands = sebaceous.

But let’s hold off and come back if needed.

Alternatively, maybe #3 is skin? No — because “integumentary” IS the skin system. That wouldn’t make sense.

Wait — the arrow says “includes” from Integumentary to two things: one is “sweat glands”, the other is #3. So #3 must be another component of the integumentary system.

Common components: epidermis, dermis, hair, nails, sweat glands, sebaceous glands.

In many textbook diagrams, they show: Integumentary → includes → sweat glands and sebaceous glands

So I’ll go with sebaceous glands for #3.

But let me double-check later if context suggests otherwise.

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4. Reproductive system includes ovaries and ???
Ovaries are female reproductive organs. The male counterpart would be testes. And below, there’s a box “which create sperm” pointing to #14. So #14 must be testes (since testes produce sperm).

Then, reproductive system includes ovaries and testes → so blank #14 = testes

And then #15? Wait, no — #14 is connected to “ovaries” via “includes” from reproductive system. So yes, #14 = testes

Then, “which create sperm” → points to #14 → which is testes → correct.

Now, what about #15? It’s connected to pituitary gland, and pituitary controls endocrine, and endocrine includes pituitary... wait, the arrow says “pituitary gland” ← includes ← Endocrine? That seems backward.

Look: “Endocrine” → includes → “pituitary gland” → and then “controls” → #15

Also, “Nervous” → controls → #15

So #15 is something controlled by both nervous and endocrine systems.

What organ is controlled by both? Often the adrenal glands or thyroid, but more commonly in basic diagrams, it’s the adrenal glands — because nervous system triggers adrenaline release via adrenal medulla, and endocrine regulates cortisol via adrenal cortex.

But another possibility: gonads? But gonads are already covered under reproductive.

Wait — pituitary gland releases hormones that control other glands. For example, it controls thyroid, adrenals, gonads.

But here, “pituitary gland” is included in endocrine, and then “controls” #15.

Also, nervous system controls #15.

This strongly suggests #15 is the adrenal glands — because:

- Adrenal medulla is directly innervated by sympathetic nervous system (so nervous control)
- Adrenal cortex is regulated by ACTH from pituitary (endocrine control)

Yes — that fits perfectly.

So blank #15 = adrenal glands

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6. Muscular system includes → ???
Muscular system includes skeletal muscles, smooth muscles, cardiac muscle. But in diagrams like this, often they say “includes” → muscles (as a general term), but that’s redundant.

Wait — look: “Muscular” → includes → #6

And #6 → filters → wastes

That doesn’t make sense for muscular system.

Wait — no! Look again:

From “Body Systems” → arrow to “Muscular”

Then “Muscular” → arrow to #6? No — actually, looking at the diagram structure:

There’s an arrow from “Muscular” to #6? Let me re-read the connections.

Actually, from the description:

“Muscular” → func → (probably “movement”)

And then “includes” → #6? No — wait, the text says:

“Muscular” → includes → #6? Actually, in the original problem statement, it says:

“Muscular” → includes → #6? Let me parse the arrows carefully.

From the user’s diagram description:

- Body Systems → Muscular
- Muscular → func → (probably movement, not labeled)
- Muscular → includes → #6? Wait, no — actually, looking at the flow:

There’s a box #6 that receives input from “Respiratory” and “Circulatory”? No.

Wait — let’s list all numbered blanks:

Blanks are: 1,2,3,6,9,13,14,15

We have:

1. brain (nervous includes brain and spinal cord)

2. regulate temperature (integumentary functions: protect tissues and regulate temp)

3. sebaceous glands (integumentary includes sweat glands and sebaceous glands)

14. testes (reproductive includes ovaries and testes; testes create sperm)

15. adrenal glands (controlled by nervous and endocrine/pituitary)

Now #6:

Looking at the diagram:

“Respiratory” → uses → #9

“Circulatory” → functions in → transport

“Circulatory” → includes → #13

#13 → breaks down → esophagus? No — #13 → includes → esophagus? That can’t be right.

Wait — “#13” → includes → esophagus? Esophagus is part of digestive system.

Ah! Here’s the key: #13 must be the Digestive System

Because:

- Digestive system includes esophagus
- Digestive system breaks down food
- Circulatory system transports nutrients from digestion

So blank #13 = Digestive

Then, “Circulatory” → includes → ? What does circulatory include? Heart, blood vessels, blood.

But in the diagram, “Circulatory” → includes → nothing directly labeled except that it functions in transport.

Wait — there’s an arrow from “Circulatory” to #13? No — #13 is separate.

Actually, from the structure:

“Body Systems” → Circulatory

“Circulatory” → functions in → transport

“Circulatory” → includes → ??? Not directly stated, but perhaps #13 is not included in circulatory.

Wait — let’s read the connections again as per the user’s text:

“- Circulatory → functions in → transport”

“- Circulatory → includes → [blank?]” — actually, in the text, it says:

“Circulatory → includes → [nothing directly]” but then there’s “#13” which is connected to “breaks down” and “includes esophagus”

So #13 is definitely Digestive System

Then, what about #6?

#6 is connected to:

- From “Body Systems” → #6? No — “Body Systems” → Respiratory, Circulatory, etc.

Actually, looking at the diagram description:

There’s a box #6 that has:

- Arrow from “Respiratory” → #6? No — “Respiratory” → uses → #9

- Arrow from “Circulatory” → #6? Not directly.

Wait — perhaps #6 is the Excretory System?

Because:

- Excretory system filters wastes

- And it might be connected to respiratory and circulatory? Respiratory excretes CO2, circulatory carries waste to kidneys.

In many diagrams, excretory system is shown filtering wastes, and it interacts with circulatory and respiratory.

Moreover, the box #6 → filters → wastes

So #6 must be Excretory

And it makes sense: Body Systems → Excretory → filters wastes

Also, respiratory system uses oxygen (from air) and produces CO2 (waste), so there’s interaction.

Circulatory carries wastes to excretory organs.

So blank #6 = Excretory

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9. Respiratory → uses → #9

Respiratory system uses oxygen

It takes in oxygen and expels carbon dioxide.

So #9 = oxygen

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Now, let’s confirm all:

1. brain — nervous includes brain and spinal cord ✔️

2. regulate temperature — integumentary protects and regulates temp ✔️

3. sebaceous glands — integumentary includes sweat and sebaceous glands ✔️ (though sometimes "oil glands" is used, but sebaceous is scientific)

6. Excretory — filters wastes ✔️

9. oxygen — respiratory uses oxygen ✔️

13. Digestive — includes esophagus, breaks down food ✔️

14. testes — reproductive includes ovaries and testes; testes create sperm ✔️

15. adrenal glands — controlled by nervous and endocrine (pituitary) ✔️

One thing: for #3, is it possible it’s “hair” or “nails”? In some simplified diagrams, they might say “sweat glands and hair”. But “sebaceous glands” is more accurate as a paired gland type.

However, let’s think: if the diagram is for middle school, they might expect “hair” or “nails”. But since “sweat glands” is specific, and sebaceous glands are equally important, I think “sebaceous glands” is correct.

But to be safe, let’s see if there’s any clue.

Another thought: in some curricula, integumentary includes “skin, hair, nails, and glands” — so if “sweat glands” is one, the other could be “sebaceous glands” or just “glands”, but since it’s a blank, likely “sebaceous glands”.

I’ll stick with that.

Final answers:

1. brain
2. regulate temperature
3. sebaceous glands
6. Excretory
9. oxygen
13. Digestive
14. testes
15. adrenal glands

Wait — for #2, is it “regulate temperature” or “maintain homeostasis”? But “regulate temperature” is more specific and matches sweat glands.

For #6, is it “Urinary” instead of “Excretory”? Because urinary system specifically filters wastes via kidneys.

In many contexts, “excretory system” refers to urinary system plus others, but in human biology, often “urinary system” is used for kidney/bladder/ureters.

But the diagram says “filters wastes” — which is primarily done by kidneys (urinary system).

Also, respiratory excretes CO2, but that’s gas exchange, not typically called “filtering”.

“Filtering” implies liquid waste removal — so likely Urinary System

Let me reconsider #6.

If #6 is “Urinary”, then:

- Urinary system filters wastes (kidneys filter blood)

- Connected to circulatory (blood brings waste to kidneys)

- Respiratory? Not directly, but overall body systems interact.

In standard K-12 diagrams, the system that “filters wastes” is the urinary system.

For example, in NGSS or state standards, urinary system is responsible for filtration.

Whereas “excretory” is a broader term that may include respiratory, digestive, urinary.

But in this diagram, since it’s a single box saying “filters wastes”, and it’s under body systems, likely Urinary

Moreover, in the diagram, there’s no mention of lungs excreting CO2 in that box — respiratory is separate.

So probably #6 = Urinary

Let me verify with logic:

- If #6 were excretory, it might encompass multiple, but the arrow says “filters wastes” — which is specific to urinary.

Also, in many textbooks, the urinary system is described as filtering waste from blood.

So I’ll change #6 to Urinary

Similarly, for #3, let’s see if “sebaceous glands” is too advanced. Maybe it’s “oil glands”? But the diagram uses “sweat glands”, so “sebaceous glands” is parallel.

But to match level, perhaps “oil glands” — but I think “sebaceous glands” is fine.

Another idea: in some diagrams, integumentary includes “sweat glands and hair follicles” — but “hair” is simpler.

Given that, and to be safe, let’s assume the expected answer for #3 is sebaceous glands unless contradicted.

But I recall that in some common worksheets, they use “sebaceous glands”.

I’ll keep it.

Final decision:

1. brain
2. regulate temperature
3. sebaceous glands
6. Urinary (changed from Excretory)
9. oxygen
13. Digestive
14. testes
15. adrenal glands

Yes.

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Final Answer:
1. brain
2. regulate temperature
3. sebaceous glands
6. Urinary
9. oxygen
13. Digestive
14. testes
15. adrenal glands