The Anatomy and Physiology of Animals/Heart Worksheet/Worksheet Answers
1. The diagram below shows an external view of the mammalian heart.
2. The diagram below shows a section through the heart seen from the same direction as the external view in question 1.
3. Choose words from the list to complete the sentences below.
- a) The top two chambers of the heart are called atria.
- b) These structures stop blood flowing backwards into the atria. Atrioventricular valves
- b) This side of the heart receives oxygenated blood. Left hand side
- c) This is the largest artery in the body. Aorta
- d These are blood vessels that carry blood towards the heart. Veins
- e) This structure sets the speed of the heat beats. Pacemaker
- g) This blood vessel supplies the heart muscle with oxygenated blood. Coronary artery
4. Fill in the name of the blood vessel in the table below.
|Name of blood vessel||Blood?||Walls?||Towards or |
away from heart
|Pulmonary artery||Deoxygenated||Thick||Away from|
5. What is the odd one out?
- a) Right atrium, right ventricle, pulmonary artery, caudal vena cava, aorta.
- The aorta is the only structure in the list that carries oxygenated blood.
- b) Left atrium, left ventricle, right ventricle, pulmonary veins, aorta, coronary artery.
- The right ventricle is the only structure in the list that carries deoxygenated blood.
6. Arrange these events of one complete heart beat cycle in the correct order starting with F.
- F. Deoxygenated blood flows from the caudal and cranial vena cavae into the right atrium.
- H. The right atrium contracts
- B. The blood flows through the right atrio-ventricular valve into the right ventricle.
- I. The right ventricle contracts and blood flows along the pulmonary artery to the lungs
- G. The deoxygenated blood picks up oxygen
- C. Oxygenated blood flows along the pulmonary veins into the left atrium
- E. The left atrium contracts
- D. The blood passes through the left atrio-ventricular valve into the left ventricle
- A. The left ventricle contracts and blood flows along the aorta to the body
7. The first hearts sound is produced by:
- b) The atrio-ventricular valves closing
8 The second heart sound is caused by:
- a) The semilunar valves closing
Label the heart
In this interactive, you can label parts of the human heart. Drag and drop the text labels onto the boxes next to the heart diagram. If you want to redo an answer, click on the box and the answer will go back to the top so you can move it to another box. If you want to check your answers, use the Reset Incorrect button. This will reset incorrect answers only. When you are happy with your selection, use the Check answers button to check them. Use Reset All to practise again from the start. Selecting or hovering over a box will highlight each area in the diagram.
For optimal viewing of this interactive, view at your screen’s default zoom setting (%) and with your browser window view maximised.
See the Labelling the heart activity for additional support in using this interactive.
Parts of the heart
Carries deoxygenated blood from the body to the heart
Flaps that prevent backflow of blood
Receives oxygenated blood from the lungs
Region of the heart that pumps oxygenated blood to the body
Carries deoxygenated blood to the lungs
Region of the heart that pumps deoxygenated blood to the lungs
Carries oxygenated blood from the lungs
Segment of the heart that receives deoxygenated blood
The main artery carrying oxygenated blood to all parts of the body
Learn the Anatomy of the Heart (by Number)
The human heart is similar to the hearts of other vertebrates. Mammals and birds (and some reptiles) have what is known as a double-loop circulatory system , where blood leaves the heart, goes to the lungs where it becomes oxygenated and then returns to the heart before delivering the oxygenated blood to the rest of the body. The heart has four chambers, and most diagrams will show the heart as it is viewed from the ventral side. This means that as you look at the heart, the left side refers to the "patient's" left side and not your left side.
**For each of the numbers described below, LABEL on the heart diagram.**
Blood that has traveled through the body supplying nutrients to tissues eventually returns to the heart through the superior vena cava (7) and the inferior vena cava (8).
Blood then enters the right atrium (1) where a small contraction pushes blood through the tricuspid valve (A) and into the right ventricle (2).
From the right ventricle, blood is pushed out through the pulmonary valve (B) and into the pulmonary trunk (5). This artery branches into two arteries, the left pulmonary artery (5L) and the right pulmonary artery (5R) which will deliver the blood to the lungs where it will become oxygenated.
Oxygenated blood returns from the lungs through the left and right pulmonary veins (9) which empties into the left atrium (3).
From the left atrium, blood goes through the bicuspid valve, which is also called the mitral valve (D) and enters the most muscular part of the heart, the left ventricle (4). A powerful contraction of the left ventricle will send blood through the aortic valve (C) and into the largest artery of the body, the aorta (6).
Blood enters the aorta and will travel to the head and shoulders through three smaller arteries: the brachiocephalic (6a), the left common carotid (6b), and the left subclavian (6c). The aorta forms an arch as blood is routed to the lower part of the body where it oxygenates organs and muscles.
Read the descriptions carefully and trace the flow of blood in the heart . Use a blue arrow to indicate deoxygenated blood and a red arrow to indicate oxygenated blood.
Mitral regurgitation is a heart condition that occurs when the mitral valve does not close fully. Based on your knowledge of the heart, describe what happens to the blood of someone who has this condition. (If you are really stumped, look it up!)
When you place your hand over your heart, you use your right hand. This is because you feel your heart more strongly on the left side of your chest, even though the heart is centered in the chest cavity. Why do you feel your heartbeat more strongly on the left side?
A ventricular septal defect occurs in some newborns where the septum (E) does not close completely during development. This can cause blood to leak between the valves. Which way is blood most likely to travel? Explain.
Are your students learning about the human heart? This page includes free printable worksheets, charts, and coloring pages of the human heart.
Human Heart Labeling Chart
This is a simple and free human heart anatomy chart for kids. Featuring six of the basic parts of the heart, each numbered and labeled for easy identification. This coordinates with our Human Heart Labeling Worksheet below.
Human Heart Labeling Worksheet
Free heart labeling worksheet for kids. Simple anatomy resources featuring six of the main parts of the human heart. Use the above anatomy chart for a reference or study guide.
Human Heart Coloring Page
This is a simple illustration of the human heart for children to color, label, or draw direction of blood flow. Use this coloring page for notebooking pages, or science displays.
Human Heart Notebooking Page
This is a free human heart notebooking page for children who are looking to store key facts and diagrams in their science notebooks. Children can color the direction of blood flow or simply label each part.
Worksheet heart anatomy labeling
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