,BIOL 252 Module 3 | Human Anatomy & Physiology II w/Lab Exam
Q&A | Portage Learning
1. Which of the following best describes the primary function of the pulmonary circuit?
A) The left side of the heart pumps deoxygenated blood to the lungs
B) The right side of the heart pumps deoxygenated blood to the lungs
C) The left side of the heart pumps oxygenated blood to the body
D) The right side of the heart pumps oxygenated blood to the lungs
Correct Answer: The right side of the heart pumps deoxygenated blood to the lungs
Rationale: The pulmonary circuit is run by the right side of the heart. The right ventricle
pumps deoxygenated blood through the pulmonary arteries to the lungs, where it picks
up oxygen. Oxygenated blood returns via the pulmonary veins to the left atrium.
2. What is the function of the systemic circuit?
A) Carry deoxygenated blood from the heart to the lungs
B) Return oxygenated blood from the lungs to the heart
C) Deliver oxygenated blood from the left side of the heart to the organs and tissues of
the body
D) Exchange gases in the pulmonary capillaries
Correct Answer: Deliver oxygenated blood from the left side of the heart to the organs
and tissues of the body
,Rationale: The systemic circuit is run by the left side of the heart. It pumps oxygenated
blood out into the vessels to supply the organs and tissues that need the blood.
3. Which chamber of the heart receives oxygenated blood from the lungs?
A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle
Correct Answer: Left atrium
Rationale: The left atrium receives oxygenated blood from the lungs via the pulmonary
veins. The right atrium receives deoxygenated blood from the body.
4. Which layer of a blood vessel contains smooth muscle?
A) Tunica intima
B) Tunica media
C) Tunica externa
D) Endothelium
Correct Answer: Tunica media
Rationale: The tunica media regulates vessel diameter via smooth muscle contraction.
This layer is thickest in arteries, which need to withstand high pressure and regulate blood
flow.
, 5. Which statement is true regarding arteries and veins?
A) Arteries always carry oxygenated blood, and veins always carry deoxygenated blood
B) Arteries have a thicker tunica media than veins to accommodate high pressure
C) All veins contain valves to prevent backflow
D) The lumen of an artery is generally larger than that of a comparable vein
Correct Answer: Arteries have a thicker tunica media than veins to accommodate high
pressure
Rationale: Arteries have a thicker and much more muscular wall (tunica media) than
veins because they carry blood under higher pressure from the pumping force of the
heart. This thickness allows them to withstand pressure without rupturing.
6. Capillary exchange primarily occurs by:
A) Active transport
B) Diffusion
C) Pinocytosis only
D) Osmosis only
Correct Answer: Diffusion
Rationale: Most gases and nutrients move by diffusion across capillary walls. The thin
walls of capillaries (simple squamous epithelium) allow for efficient diffusion of oxygen,
carbon dioxide, nutrients, and wastes.
Q&A | Portage Learning
1. Which of the following best describes the primary function of the pulmonary circuit?
A) The left side of the heart pumps deoxygenated blood to the lungs
B) The right side of the heart pumps deoxygenated blood to the lungs
C) The left side of the heart pumps oxygenated blood to the body
D) The right side of the heart pumps oxygenated blood to the lungs
Correct Answer: The right side of the heart pumps deoxygenated blood to the lungs
Rationale: The pulmonary circuit is run by the right side of the heart. The right ventricle
pumps deoxygenated blood through the pulmonary arteries to the lungs, where it picks
up oxygen. Oxygenated blood returns via the pulmonary veins to the left atrium.
2. What is the function of the systemic circuit?
A) Carry deoxygenated blood from the heart to the lungs
B) Return oxygenated blood from the lungs to the heart
C) Deliver oxygenated blood from the left side of the heart to the organs and tissues of
the body
D) Exchange gases in the pulmonary capillaries
Correct Answer: Deliver oxygenated blood from the left side of the heart to the organs
and tissues of the body
,Rationale: The systemic circuit is run by the left side of the heart. It pumps oxygenated
blood out into the vessels to supply the organs and tissues that need the blood.
3. Which chamber of the heart receives oxygenated blood from the lungs?
A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle
Correct Answer: Left atrium
Rationale: The left atrium receives oxygenated blood from the lungs via the pulmonary
veins. The right atrium receives deoxygenated blood from the body.
4. Which layer of a blood vessel contains smooth muscle?
A) Tunica intima
B) Tunica media
C) Tunica externa
D) Endothelium
Correct Answer: Tunica media
Rationale: The tunica media regulates vessel diameter via smooth muscle contraction.
This layer is thickest in arteries, which need to withstand high pressure and regulate blood
flow.
, 5. Which statement is true regarding arteries and veins?
A) Arteries always carry oxygenated blood, and veins always carry deoxygenated blood
B) Arteries have a thicker tunica media than veins to accommodate high pressure
C) All veins contain valves to prevent backflow
D) The lumen of an artery is generally larger than that of a comparable vein
Correct Answer: Arteries have a thicker tunica media than veins to accommodate high
pressure
Rationale: Arteries have a thicker and much more muscular wall (tunica media) than
veins because they carry blood under higher pressure from the pumping force of the
heart. This thickness allows them to withstand pressure without rupturing.
6. Capillary exchange primarily occurs by:
A) Active transport
B) Diffusion
C) Pinocytosis only
D) Osmosis only
Correct Answer: Diffusion
Rationale: Most gases and nutrients move by diffusion across capillary walls. The thin
walls of capillaries (simple squamous epithelium) allow for efficient diffusion of oxygen,
carbon dioxide, nutrients, and wastes.
