Sheep Heart Dissection - Free Printable
Educational worksheet: Sheep Heart Dissection. Download and print for classroom or home learning activities.
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Show Answer Key & Explanations
Step-by-step solution for: Sheep Heart Dissection
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Show Answer Key & Explanations
Step-by-step solution for: Sheep Heart Dissection
Let’s go through each question step by step, using what we know about the heart and how blood flows through it.
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1. Identify the right and left sides of the heart.
When you’re looking at a real heart (or a diagram), imagine you’re facing the person whose heart it is — so their right side is on your left, and their left side is on your right. But in most diagrams or dissections, they label it as if you’re looking at the front of the heart from the person’s perspective. So:
- The right side of the heart pumps blood to the lungs.
- The left side pumps blood to the rest of the body.
In the image, the labels show “Right atrium” and “Left ventricle,” etc., so we can use those to tell which side is which.
✔ Final Answer for #1:
The side with the right atrium and right ventricle is the right side.
The side with the left atrium and left ventricle is the left side.
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2. Locate coronary arteries and veins.
These are small blood vessels that supply oxygen to the heart muscle itself. They run along the surface of the heart, often near the top (base) where the big vessels come out.
You might see them as thin red (arteries) or blue/purple (veins) lines wrapping around the heart.
✔ Final Answer for #2:
Coronary arteries and veins are found on the outer surface of the heart, especially near the top (base) and running down between the chambers.
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3. Find flaps of dark tissue on top of the heart — these are called ________.
Those flaps are the auricles — little ear-shaped pouches attached to the atria. They help increase the volume of the atria.
✔ Final Answer for #3:
They are called auricles.
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4. From the most ventral part, find a large, thick-walled vessel going up toward the right shoulder — this is the ________.
“Ventral” means front. The large thick-walled vessel coming off the top of the heart going upward is the aorta. It carries oxygen-rich blood from the left ventricle to the body.
✔ Final Answer for #4:
This is the aorta.
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5. Find the heart tip pointing downward — this is the ________.
The bottom pointy end of the heart is called the apex. It usually points down and to the left.
✔ Final Answer for #5:
This is the apex.
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6. Turn heart over; locate opening on backside — this leads into the ________.
On the back of the heart, there’s an opening that lets deoxygenated blood enter the right atrium. That’s the superior vena cava (from upper body) and inferior vena cava (from lower body). Since the question says “opening on the backside,” it’s likely referring to one of these — probably the superior vena cava since it’s more visible from behind.
But actually, both venae cavae open into the right atrium.
Wait — let’s read again: “locate the opening on the backside... This opening leads into the ________.”
It’s asking for the chamber it leads into — not the name of the vein.
So: Blood enters the right atrium via the vena cavae.
✔ Final Answer for #6:
This opening leads into the right atrium.
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7. Insert probe into pulmonary trunk — follows path of blood leaving the right ventricle.
Yes — the pulmonary trunk comes out of the right ventricle and splits into left and right pulmonary arteries to carry blood to the lungs.
✔ Final Answer for #7:
Blood leaves the right ventricle → goes into the pulmonary trunk.
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8. Insert probe into aorta — follows path of blood leaving the left ventricle.
Correct — the aorta starts at the left ventricle and carries oxygen-rich blood to the whole body.
✔ Final Answer for #8:
Blood leaves the left ventricle → goes into the aorta.
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9. Make incision following line marked X — opens into the ________.
Looking at typical sheep heart dissection guides, cutting along line X (usually across the ventricles) opens into the ventricles — specifically, you’ll see the inside of the left and/or right ventricle depending on where you cut.
Since the line is drawn across the middle of the heart, it’s likely opening into the ventricular cavities.
But let’s be precise: If you cut horizontally across the ventricles, you open into the chambers of the ventricles.
✔ Final Answer for #9:
Opens into the ventricles (or ventricular chambers).
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10. Are any valves visible? Name them.
Inside the heart, you should see:
- Between atria and ventricles: tricuspid valve (right side) and bicuspid/mitral valve (left side)
- At the exits: pulmonary valve (between right ventricle and pulmonary trunk) and aortic valve (between left ventricle and aorta)
Depending on how deep you cut, you may see some of these.
✔ Final Answer for #10:
Possible valves visible: tricuspid valve, mitral (bicuspid) valve, pulmonary valve, aortic valve.
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11. Vessels connected to which chambers?
Let’s match them:
- Pulmonary artery → carries blood AWAY from heart → from right ventricle
- Pulmonary vein → brings blood TO heart → to left atrium
- Aorta → carries blood AWAY → from left ventricle
- Superior vena cava → brings blood TO heart → to right atrium
✔ Final Answer for #11:
- Pulmonary artery connects to the right ventricle
- Pulmonary vein connects to the left atrium
- Aorta connects to the left ventricle
- Superior vena cava connects to the right atrium
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Now, compiling all final answers clearly:
──────────────────────────────────────
Final Answer:
1. Right side = right atrium & right ventricle; Left side = left atrium & left ventricle
2. On the outer surface, especially near the base (top) of the heart
3. Auricles
4. Aorta
5. Apex
6. Right atrium
7. Right ventricle
8. Left ventricle
9. Ventricles (or ventricular chambers)
10. Tricuspid valve, mitral (bicuspid) valve, pulmonary valve, aortic valve (depending on view)
11.
- Pulmonary artery → right ventricle
- Pulmonary vein → left atrium
- Aorta → left ventricle
- Superior vena cava → right atrium
---
1. Identify the right and left sides of the heart.
When you’re looking at a real heart (or a diagram), imagine you’re facing the person whose heart it is — so their right side is on your left, and their left side is on your right. But in most diagrams or dissections, they label it as if you’re looking at the front of the heart from the person’s perspective. So:
- The right side of the heart pumps blood to the lungs.
- The left side pumps blood to the rest of the body.
In the image, the labels show “Right atrium” and “Left ventricle,” etc., so we can use those to tell which side is which.
✔ Final Answer for #1:
The side with the right atrium and right ventricle is the right side.
The side with the left atrium and left ventricle is the left side.
---
2. Locate coronary arteries and veins.
These are small blood vessels that supply oxygen to the heart muscle itself. They run along the surface of the heart, often near the top (base) where the big vessels come out.
You might see them as thin red (arteries) or blue/purple (veins) lines wrapping around the heart.
✔ Final Answer for #2:
Coronary arteries and veins are found on the outer surface of the heart, especially near the top (base) and running down between the chambers.
---
3. Find flaps of dark tissue on top of the heart — these are called ________.
Those flaps are the auricles — little ear-shaped pouches attached to the atria. They help increase the volume of the atria.
✔ Final Answer for #3:
They are called auricles.
---
4. From the most ventral part, find a large, thick-walled vessel going up toward the right shoulder — this is the ________.
“Ventral” means front. The large thick-walled vessel coming off the top of the heart going upward is the aorta. It carries oxygen-rich blood from the left ventricle to the body.
✔ Final Answer for #4:
This is the aorta.
---
5. Find the heart tip pointing downward — this is the ________.
The bottom pointy end of the heart is called the apex. It usually points down and to the left.
✔ Final Answer for #5:
This is the apex.
---
6. Turn heart over; locate opening on backside — this leads into the ________.
On the back of the heart, there’s an opening that lets deoxygenated blood enter the right atrium. That’s the superior vena cava (from upper body) and inferior vena cava (from lower body). Since the question says “opening on the backside,” it’s likely referring to one of these — probably the superior vena cava since it’s more visible from behind.
But actually, both venae cavae open into the right atrium.
Wait — let’s read again: “locate the opening on the backside... This opening leads into the ________.”
It’s asking for the chamber it leads into — not the name of the vein.
So: Blood enters the right atrium via the vena cavae.
✔ Final Answer for #6:
This opening leads into the right atrium.
---
7. Insert probe into pulmonary trunk — follows path of blood leaving the right ventricle.
Yes — the pulmonary trunk comes out of the right ventricle and splits into left and right pulmonary arteries to carry blood to the lungs.
✔ Final Answer for #7:
Blood leaves the right ventricle → goes into the pulmonary trunk.
---
8. Insert probe into aorta — follows path of blood leaving the left ventricle.
Correct — the aorta starts at the left ventricle and carries oxygen-rich blood to the whole body.
✔ Final Answer for #8:
Blood leaves the left ventricle → goes into the aorta.
---
9. Make incision following line marked X — opens into the ________.
Looking at typical sheep heart dissection guides, cutting along line X (usually across the ventricles) opens into the ventricles — specifically, you’ll see the inside of the left and/or right ventricle depending on where you cut.
Since the line is drawn across the middle of the heart, it’s likely opening into the ventricular cavities.
But let’s be precise: If you cut horizontally across the ventricles, you open into the chambers of the ventricles.
✔ Final Answer for #9:
Opens into the ventricles (or ventricular chambers).
---
10. Are any valves visible? Name them.
Inside the heart, you should see:
- Between atria and ventricles: tricuspid valve (right side) and bicuspid/mitral valve (left side)
- At the exits: pulmonary valve (between right ventricle and pulmonary trunk) and aortic valve (between left ventricle and aorta)
Depending on how deep you cut, you may see some of these.
✔ Final Answer for #10:
Possible valves visible: tricuspid valve, mitral (bicuspid) valve, pulmonary valve, aortic valve.
---
11. Vessels connected to which chambers?
Let’s match them:
- Pulmonary artery → carries blood AWAY from heart → from right ventricle
- Pulmonary vein → brings blood TO heart → to left atrium
- Aorta → carries blood AWAY → from left ventricle
- Superior vena cava → brings blood TO heart → to right atrium
✔ Final Answer for #11:
- Pulmonary artery connects to the right ventricle
- Pulmonary vein connects to the left atrium
- Aorta connects to the left ventricle
- Superior vena cava connects to the right atrium
---
Now, compiling all final answers clearly:
──────────────────────────────────────
Final Answer:
1. Right side = right atrium & right ventricle; Left side = left atrium & left ventricle
2. On the outer surface, especially near the base (top) of the heart
3. Auricles
4. Aorta
5. Apex
6. Right atrium
7. Right ventricle
8. Left ventricle
9. Ventricles (or ventricular chambers)
10. Tricuspid valve, mitral (bicuspid) valve, pulmonary valve, aortic valve (depending on view)
11.
- Pulmonary artery → right ventricle
- Pulmonary vein → left atrium
- Aorta → left ventricle
- Superior vena cava → right atrium
Parent Tip: Review the logic above to help your child master the concept of sheep heart dissection worksheet.
