Anatomy and Physiology Cardiovascular System 2 — Questions and Answers
Question 1: Which type of blood vessel has the thickest walls and is designed to withstand the highest pressures?
- Capillaries
- Veins
- Venules
- Arteries (Correct answer)
Correct answer: Arteries
Arteries have thick, elastic walls composed of three layers (tunica intima, media, and externa) to withstand the high pressure of blood ejected from the heart.
Question 2: What is the primary function of capillaries?
- Return blood to the heart
- Exchange gases, nutrients, and waste products with tissues (Correct answer)
- Transport blood away from the heart at high pressure
- Regulate systemic blood pressure
Correct answer: Exchange gases, nutrients, and waste products with tissues
Capillaries are the site of exchange between blood and tissues, allowing oxygen, nutrients, and waste products to move across their thin walls.
Question 3: Which vessel carries oxygenated blood from the lungs back to the heart?
- Pulmonary artery
- Aorta
- Pulmonary vein (Correct answer)
- Superior vena cava
Correct answer: Pulmonary vein
The pulmonary veins (four in total) return oxygen-rich blood from the lungs to the left atrium of the heart.
Question 4: Systolic blood pressure represents:
- The pressure in arteries when the heart is relaxing between beats
- The pressure in veins during heart contraction
- The pressure in arteries when the ventricles are contracting (Correct answer)
- The average arterial pressure throughout the entire cardiac cycle
Correct answer: The pressure in arteries when the ventricles are contracting
Systolic pressure is the peak pressure in the arteries that occurs when the left ventricle contracts and ejects blood into the aorta.
Question 5: The aorta is classified as the largest:
- Vein in the body
- Artery in the body (Correct answer)
- Capillary bed in the body
- Lymphatic vessel in the body
Correct answer: Artery in the body
The aorta is the largest artery in the body, originating from the left ventricle and distributing oxygenated blood to the systemic circulation.
Question 6: Which layer of an arterial wall contains smooth muscle that controls vessel diameter?
- Tunica intima
- Tunica externa
- Endothelium
- Tunica media (Correct answer)
Correct answer: Tunica media
The tunica media is the middle layer of the arterial wall composed primarily of smooth muscle and elastic fibers that regulate vasoconstriction and vasodilation.
Question 7: Vasoconstriction refers to:
- Widening of blood vessel lumens
- Formation of new blood vessels (angiogenesis)
- Narrowing of blood vessel lumens (Correct answer)
- Rupture of a blood vessel wall
Correct answer: Narrowing of blood vessel lumens
Vasoconstriction is the narrowing of blood vessel lumens caused by smooth muscle contraction in the tunica media, which increases vascular resistance and blood pressure.
Anatomy and Physiology Cardiovascular System 2
Which type of blood vessel has the thickest walls and is designed to withstand the highest pressures?