BIOD 152 Module 4: BIOD 152 Module 4 Question Bank: Latest Updated:
Questions & Answers
Question 1
The circulatory system is responsible for which of the following functions?
• A. Supply cells with oxygen
• B. Transportation of gases
• C. Rid cells of waste
• D. Prevents loss of blood
• E. All the above
• Correct Answer: E. All the above
Rationale: The circulatory system acts as a transportation network that
supplies all human cells with oxygen and nutrients, removes metabolic
waste, and transports gases. Additionally, it prevents blood loss from
ruptured vessels through specialized clotting mechanisms and protects the
body against invading pathogens.
Question 2
The pericardial cavity contains which of the following organs?
• A. Lungs
• B. Heart
• C. Descending aorta
• D. Circle of Willis
• Correct Answer: B. Heart
, Rationale: The heart is a fist-sized, cone-shaped muscular organ located
specifically within the pericardial cavity in the anterior portion of the
mediastinum.
Question 3
Which layer of the heart is composed of the contractile cardiac muscle?
• A. Pericardium
• B. Endocardium
• C. Myocardium
• D. Mediastinal
Correct Answer: C. Myocardium
• Rationale: The bulk of the heart wall is the myocardium, which is composed
of branched cardiac muscle fibers and is the layer responsible for
contracting to pump blood.
Question 4
Which layer of the heart protects it and anchors it to the diaphragm?
• A. Endocardium
• B. Mediastinal
• C. Myocardium
• D. Pericardium
Correct Answer: D. Pericardium
Rationale: The heart is enclosed in a tough, thick sac called the
pericardium, which serves to protect the heart and anchor it securely to the
diaphragm.
, Question 5
What is the purpose of the fossa ovalis in all developing fetuses?
• A. To allow fetal blood to move directly from the right to the left atrium,
bypassing the underdeveloped lungs
• B. To allow oxygenated blood to bypass the liver
• C. To pump blood from the left ventricle into the pulmonary trunk
• D. To prevent the backflow of deoxygenated blood into the vena cava
Correct Answer: A. To allow fetal blood to move directly from the right to
the left atrium, bypassing the underdeveloped lungs
• Rationale: In a developing fetus, the lungs are underdeveloped and non-
functional. The fossa ovalis marks the site of a fetal opening on the
interatrial septum that allows blood to bypass the lungs by shunting directly
from the right atrium to the left atrium.
Question 6
What is the function of the mitral valve?
• A. Controls the flow of blood leaving the right ventricle into the pulmonary
trunk
• B. Controls the flow of blood out of the left ventricle into the aorta
• C. Controls the flow of blood from the left atrium into the left ventricle
• D. Controls the flow of blood from the right atrium into the right ventricle
Correct Answer: C. Controls the flow of blood from the left atrium into the
left ventricle
• Rationale: The mitral (also known as bicuspid or left AV) valve is a one-way
valve located on the left side of the heart that controls and regulates the
Questions & Answers
Question 1
The circulatory system is responsible for which of the following functions?
• A. Supply cells with oxygen
• B. Transportation of gases
• C. Rid cells of waste
• D. Prevents loss of blood
• E. All the above
• Correct Answer: E. All the above
Rationale: The circulatory system acts as a transportation network that
supplies all human cells with oxygen and nutrients, removes metabolic
waste, and transports gases. Additionally, it prevents blood loss from
ruptured vessels through specialized clotting mechanisms and protects the
body against invading pathogens.
Question 2
The pericardial cavity contains which of the following organs?
• A. Lungs
• B. Heart
• C. Descending aorta
• D. Circle of Willis
• Correct Answer: B. Heart
, Rationale: The heart is a fist-sized, cone-shaped muscular organ located
specifically within the pericardial cavity in the anterior portion of the
mediastinum.
Question 3
Which layer of the heart is composed of the contractile cardiac muscle?
• A. Pericardium
• B. Endocardium
• C. Myocardium
• D. Mediastinal
Correct Answer: C. Myocardium
• Rationale: The bulk of the heart wall is the myocardium, which is composed
of branched cardiac muscle fibers and is the layer responsible for
contracting to pump blood.
Question 4
Which layer of the heart protects it and anchors it to the diaphragm?
• A. Endocardium
• B. Mediastinal
• C. Myocardium
• D. Pericardium
Correct Answer: D. Pericardium
Rationale: The heart is enclosed in a tough, thick sac called the
pericardium, which serves to protect the heart and anchor it securely to the
diaphragm.
, Question 5
What is the purpose of the fossa ovalis in all developing fetuses?
• A. To allow fetal blood to move directly from the right to the left atrium,
bypassing the underdeveloped lungs
• B. To allow oxygenated blood to bypass the liver
• C. To pump blood from the left ventricle into the pulmonary trunk
• D. To prevent the backflow of deoxygenated blood into the vena cava
Correct Answer: A. To allow fetal blood to move directly from the right to
the left atrium, bypassing the underdeveloped lungs
• Rationale: In a developing fetus, the lungs are underdeveloped and non-
functional. The fossa ovalis marks the site of a fetal opening on the
interatrial septum that allows blood to bypass the lungs by shunting directly
from the right atrium to the left atrium.
Question 6
What is the function of the mitral valve?
• A. Controls the flow of blood leaving the right ventricle into the pulmonary
trunk
• B. Controls the flow of blood out of the left ventricle into the aorta
• C. Controls the flow of blood from the left atrium into the left ventricle
• D. Controls the flow of blood from the right atrium into the right ventricle
Correct Answer: C. Controls the flow of blood from the left atrium into the
left ventricle
• Rationale: The mitral (also known as bicuspid or left AV) valve is a one-way
valve located on the left side of the heart that controls and regulates the
