BIOD 152 LAB 4 EXAM 2026 | CIRCULATORY
SYSTEM & BLOOD FLOW TRACINGS QUESTIONS
BIOD 152 Lab 4 Exam — Circulatory System & Blood Flow Tracings
Portage Learning | A&P II | 2026/2027 Edition
Full Practice Exam with Verified Answers & Detailed Explanations
Section 1: Heart Anatomy and Orientation
Question 1
The heart is located in the mediastinum. Which of the following best describes the
orientation of the heart within the chest?
A. The apex of the heart points toward the right side of the body
B. The apex of the heart points toward the left hip, and the base is directed
toward the right shoulder
C. The heart sits perfectly vertical with no tilt in either direction
D. The apex points toward the sternum, and the base faces the spine
Correct Answer: B
Rationale: The heart is a cone-shaped organ that sits tilted within the
mediastinum. Its broad base is anchored near the right second rib, while its
pointed apex is directed downward, forward, and to the left—roughly at the level
of the fifth intercostal space. This leftward tilt is why the heartbeat is most
strongly felt on the left side of the chest .
Question 2
,Which chamber of the heart receives oxygenated blood returning from the lungs?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Correct Answer: C
Rationale: The left atrium receives oxygenated blood from the lungs via the four
pulmonary veins. From there, blood passes through the bicuspid (mitral) valve
into the left ventricle, which pumps it out through the aortic valve into the aorta
for systemic distribution. The right atrium receives deoxygenated blood from the
body .
Question 3
Which layer of the heart anchors it to the diaphragm?
A. Endocardium
B. Myocardium
C. Pericardium
D. Mediastinum
Correct Answer: C
Rationale: The pericardium is the fibrous sac that surrounds the heart. Its outer
fibrous layer anchors the heart to surrounding structures, including the
diaphragm. The endocardium lines the chambers, and the myocardium is the
muscular layer responsible for contraction .
Section 2: Blood Vessel Structure and Function
Question 4
Which type of blood vessel always carries blood away from the heart?
, A. Arteries
B. Veins
C. Capillaries
D. Venules
Correct Answer: A
Rationale: Arteries are referred to as efferent blood vessels in the circulatory
system and always carry blood away from the heart. They typically carry
oxygenated blood except for the pulmonary artery, which carries deoxygenated
blood to the lungs .
Question 5
Conducting arteries, such as the aorta and pulmonary trunk, have which
characteristic that allows them to withstand the surge of blood during each
heartbeat?
A. Thick smooth muscle layers
B. A layer of elastic tissue allowing stretch and recoil
C. Valves to prevent backflow
D. Thin walls for gas exchange
Correct Answer: B
Rationale: Conducting arteries have a layer of elastic tissue that gives them the
ability to stretch when blood surges out of the heart with each heartbeat and
recoil when the heart is relaxing. This elastic recoil helps maintain continuous
blood flow during diastole .
Question 6
Distributing arteries, such as the brachial and femoral arteries, are characterized
by:
SYSTEM & BLOOD FLOW TRACINGS QUESTIONS
BIOD 152 Lab 4 Exam — Circulatory System & Blood Flow Tracings
Portage Learning | A&P II | 2026/2027 Edition
Full Practice Exam with Verified Answers & Detailed Explanations
Section 1: Heart Anatomy and Orientation
Question 1
The heart is located in the mediastinum. Which of the following best describes the
orientation of the heart within the chest?
A. The apex of the heart points toward the right side of the body
B. The apex of the heart points toward the left hip, and the base is directed
toward the right shoulder
C. The heart sits perfectly vertical with no tilt in either direction
D. The apex points toward the sternum, and the base faces the spine
Correct Answer: B
Rationale: The heart is a cone-shaped organ that sits tilted within the
mediastinum. Its broad base is anchored near the right second rib, while its
pointed apex is directed downward, forward, and to the left—roughly at the level
of the fifth intercostal space. This leftward tilt is why the heartbeat is most
strongly felt on the left side of the chest .
Question 2
,Which chamber of the heart receives oxygenated blood returning from the lungs?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Correct Answer: C
Rationale: The left atrium receives oxygenated blood from the lungs via the four
pulmonary veins. From there, blood passes through the bicuspid (mitral) valve
into the left ventricle, which pumps it out through the aortic valve into the aorta
for systemic distribution. The right atrium receives deoxygenated blood from the
body .
Question 3
Which layer of the heart anchors it to the diaphragm?
A. Endocardium
B. Myocardium
C. Pericardium
D. Mediastinum
Correct Answer: C
Rationale: The pericardium is the fibrous sac that surrounds the heart. Its outer
fibrous layer anchors the heart to surrounding structures, including the
diaphragm. The endocardium lines the chambers, and the myocardium is the
muscular layer responsible for contraction .
Section 2: Blood Vessel Structure and Function
Question 4
Which type of blood vessel always carries blood away from the heart?
, A. Arteries
B. Veins
C. Capillaries
D. Venules
Correct Answer: A
Rationale: Arteries are referred to as efferent blood vessels in the circulatory
system and always carry blood away from the heart. They typically carry
oxygenated blood except for the pulmonary artery, which carries deoxygenated
blood to the lungs .
Question 5
Conducting arteries, such as the aorta and pulmonary trunk, have which
characteristic that allows them to withstand the surge of blood during each
heartbeat?
A. Thick smooth muscle layers
B. A layer of elastic tissue allowing stretch and recoil
C. Valves to prevent backflow
D. Thin walls for gas exchange
Correct Answer: B
Rationale: Conducting arteries have a layer of elastic tissue that gives them the
ability to stretch when blood surges out of the heart with each heartbeat and
recoil when the heart is relaxing. This elastic recoil helps maintain continuous
blood flow during diastole .
Question 6
Distributing arteries, such as the brachial and femoral arteries, are characterized
by:
