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# 23.1: The Circulatory System

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## Lesson 23.1: True or False

Name___________________ Class______________ Date________

Write true if the statement is true or false if the statement is false.

_____ 1. The heart has four chambers: two upper ventricles and two lower atria.

_____ 2. Capillaries are the largest of the blood vessels.

_____ 3. High blood pressure is also known as hypertension.

_____ 4. Blood is a connective tissue.

_____ 5. The systemic circulation carries blood between the heart and body.

_____ 6. The pulmonary circulation carries blood between the heart and body.

_____ 7. White blood cells carry oxygen in the blood.

_____ 8. A heart attack occurs when the blood supply to part of the heart is blocked and cardiac muscle tissue dies.

_____ 9. Cells in blood include red blood cells, white blood cells, green blood cells, and platelets.

_____ 10. ABO blood type is determined by three common antigens, often referred to as antigens A, B, and O.

_____ 11. Smoking contributes to the development of atherosclerosis.

_____ 12. Blood pressure is highest in the veins and lowest in the arteries.

_____ 13. The leading cause of cardiovascular disease is atherosclerosis.

_____ 14. Platelets release chemicals that are needed for blood clotting.

_____ 15. Diseases of the heart and blood vessels are very common.

Name___________________ Class______________ Date________

Read these passages from the text and answer the questions that follow.

The Heart

The heart is a muscular organ in the chest. It consists mainly of cardiac muscle tissue and pumps blood through blood vessels by repeated, rhythmic contractions. The heart has four chambers, as illustrated below: two upper atria (singular, atrium) and two lower ventricles. Valves between chambers keep blood flowing through the heart in just one direction.

The chambers of the heart and the valves between them are shown here. (Image courtesy of Wapcaplet and Yaddah and under GNU-FDL 1.2.)

Blood Flow Through the Heart

Blood flows through the heart in two separate loops, which are indicated by the arrows in the figure above.

1. Blood from the body enters the right atrium of the heart. The right atrium pumps the blood to the right ventricle, which pumps it to the lungs. This loop is represented by the blue arrows in the figure above.
2. Blood from the lungs enters the left atrium of the heart. The left atrium pumps the blood to the left ventricle, which pumps it to the body. This loop is represented by the red arrows in the figure above.

Heartbeat

Unlike skeletal muscle, cardiac muscle contracts without stimulation by the nervous system. Instead, specialized cardiac muscle cells send out electrical impulses that stimulate the contractions. As a result, the atria and ventricles normally contract with just the right timing to keep blood pumping efficiently through the heart.

Questions

1. What is the role of the heart?

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2. The ____________ chambers of the heart are: ____________ , ____________ , ____________ , ____________ .

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3. What is the main difference between the right side and left side of the heart?

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4. What causes the heart to beat? Describe how this occurs.

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## Lesson 23.1: Multiple Choice

Name___________________ Class______________ Date________

Circle the letter of the correct choice.

1. The materials carried by the circulatory system include which of the following? (1) blood, (2) hormones, (3) oxygen, (4) cellular wastes.
1. 1 only
2. 1 and 2
3. 1, 2, and 3
4. 1, 2, 3, and 4
2. The correct order of blood flow is
1. aorta → right atrium → right ventricle → lungs → left atrium → left ventricle → vena cava.
2. vena cava → right atrium → right ventricle → lungs → left atrium → left ventricle → aorta.
3. vena cava → left atrium → left ventricle → lungs → right atrium → right ventricle → aorta.
4. aorta → left atrium → left ventricle → lungs → right atrium → right ventricle → vena cava.
3. The major blood vessels include
1. arteries.
2. veins.
3. capillaries.
4. all of the above.
4. Which statement is correct?
1. The pulmonary circulation carries blood between the heart and lungs, while the systemic circulation carries blood between the heart and body.
2. The systemic circulation carries blood between the heart and lungs, while the pulmonary circulation carries blood between the heart and body.
3. The systemic circulation carries blood between the heart and lungs, while the pulmonary circulation carries oxygen between the heart and body.
4. The pulmonary circulation carries oxygen between the heart and lungs, while the systemic circulation carries blood between the heart and body.
5. Atherosclerosis
1. occurs when the blood supply to part of the heart muscle is blocked.
2. is the buildup of plaque inside arteries.
3. consists of cell debris, cholesterol, and other substances.
4. all of the above
6. Blood
1. in veins carries carbon dioxide and nutrients, while blood in arteries carries oxygen and other wastes.
2. in veins carries oxygen and nutrients, while blood in arteries carries carbon dioxide and other wastes.
3. in arteries carries oxygen and nutrients, while blood in veins carries carbon dioxide and other wastes.
4. in arteries carries carbon dioxide and nutrients, while blood in veins carries oxygen and other wastes.
7. Plasma includes
1. white blood cells.
2. red blood cells.
3. platelets.
4. all of the above.
8. Roles of blood include which of the following? (1) defending the body against infection, (2) repairing body tissues, (3) transporting water from the lungs to body cells (4) controlling the body’s pH.
1. 1 and 2
2. 1, 2, and 3
3. 1, 2, and 4
4. 1, 2, 3, and 4

## Lesson 23.1: Vocabulary I

Name___________________ Class______________ Date________

Match the vocabulary word with the proper definition.

Definitions

_____ 1. the smallest type of blood vessel

_____ 2. the part of the circulatory system that carries blood between the heart and body

_____ 3. diseases of the heart and blood vessels

_____ 4. transports materials from one place to another

_____ 5. blood vessel that carries blood toward the heart

_____ 6. carries oxygen

_____ 7. a fluid connective tissue

_____ 8. muscular blood vessel that carries blood away from the heart

_____ 9. the buildup of plaque inside arteries

_____ 10. the fluid part of blood

_____ 11. the part of the circulatory system that carries blood between the heart and lungs

_____ 12. occurs when the blood supply to part of the heart muscle is blocked and cardiac muscle fibers die

Terms

a. artery

b. atherosclerosis

c. blood

d. capillary

e. cardiovascular disease

f. circulatory system

g. heart attack

h. plasma

i. pulmonary circulation

j. red blood cell

k. systemic circulation

l. vein

## Lesson 23.1: Vocabulary II

Name___________________ Class______________ Date________

Fill in the blank with the appropriate term.

1. Red blood cells contain ____________, a protein with iron that binds with oxygen.

2. The most commonly known blood types are the ____________ and Rhesus blood types.

3. The exchange of gases between cells and blood takes place across the thin walls of ____________.

4. Cardiac muscle contracts without stimulation by the ____________ system.

5. Platelets are cell fragments involved in blood ____________.

6. The main components of the circulatory system are the heart, blood vessels, and ____________.

7. The ____________ has four chambers: two upper atria, and two lower ventricles.

8. Arteries are muscular vessels that carry blood ____________ from the heart.

9. ____________ circulation is the part of the circulatory system that carries blood between the heart and body.

10. Pulmonary circulation is the part of the circulatory system that carries blood between the heart and ____________.

11. ____________ generally carry deoxygenated blood.

12. ____________ is the buildup of plaque inside arteries.

## Lesson 23.1: Critical Writing

Name___________________ Class______________ Date________

Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences.

Define and outline pathways of the pulmonary and systemic circulations.

Feb 23, 2012

Jun 06, 2014