,BIOD152/BIOD 152 Module 4 Exam | Essential Human
Anatomy & Physiology II with Lab | Portage Learning | Q & A |
2026/2027 Edition (PDF)
1. Which body system supplies cells with oxygen and nutrients and carries away waste?
A) Nervous system
B) Respiratory system
C) Urinary system
D) Circulatory system
Correct Answer: Circulatory system
Rationale: The circulatory system transports oxygen, nutrients, and waste products throughout the
body. While other systems perform one of these functions, only the circulatory system carries out all the
functions listed above. The nervous system transmits signals, the respiratory system exchanges gases,
and the urinary system filters waste.
2. The pericardial cavity contains which structure?
A) Lungs
B) Heart
C) Descending aorta
D) Circle of Willis
Correct Answer: Heart
Rationale: The pericardial cavity is a fluid-filled space within the pericardium that surrounds the heart. It
contains the heart and provides lubrication to reduce friction during cardiac contractions. The lungs are
in the pleural cavities, and the aorta and Circle of Willis are blood vessels outside this specific space.
3. Which layer of the heart wall is composed primarily of contractile cardiac muscle?
A) Pericardium
,B) Endocardium
C) Myocardium
D) Mediastinum
Correct Answer: Myocardium
Rationale: The myocardium is the thick middle layer of the heart wall consisting of cardiac muscle cells
responsible for the contractile force that pumps blood. The pericardium is the outer sac, the
endocardium lines the inner chambers, and the mediastinum is the anatomical region containing the
heart.
4. What is the purpose of the fossa ovalis in a fetus?
A) It allows blood to flow from the left atrium to the right atrium
B) It allows fetal blood to move directly from the right atrium to the left atrium, bypassing the lungs
C) It connects the pulmonary artery to the aorta
D) It serves as a valve between the ventricles
Correct Answer: It allows fetal blood to move directly from the right atrium to the left atrium, bypassing
the lungs
Rationale: The fossa ovalis is an opening between the atria in the fetal heart that allows blood to bypass
the undeveloped lungs. It closes shortly after birth, forming the fossa ovalis, so that the lungs can
receive oxygen once the baby begins to breathe.
5. Which layer of the heart anchors it to the diaphragm?
A) Endocardium
B) Mediastinal layer
C) Myocardium
D) Pericardium
Correct Answer: Pericardium
, 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.
6. The tough, thick sac that encloses the heart and anchors it to surrounding structures is the:
A) Epicardium
B) Myocardium
C) Fibrous pericardium
D) Serous pericardium
Correct Answer: Fibrous pericardium
Rationale: The fibrous pericardium is the tough, outer layer of the pericardial sac. It anchors the heart to
surrounding structures such as the diaphragm and sternum, providing protection and preventing
overdistension of the heart.
7. The serous membrane that directly covers the heart is called the:
A) Parietal pericardium
B) Visceral pericardium (epicardium)
C) Fibrous pericardium
D) Endocardium
Correct Answer: Visceral pericardium (epicardium)
Rationale: The visceral pericardium, also known as the epicardium, is the innermost layer of the
pericardium that directly covers the heart. The parietal pericardium lines the fibrous pericardium, and
the endocardium lines the heart chambers.
8. Which of the following correctly lists the layers of the heart wall from superficial to deep?
A) Endocardium, myocardium, epicardium
Anatomy & Physiology II with Lab | Portage Learning | Q & A |
2026/2027 Edition (PDF)
1. Which body system supplies cells with oxygen and nutrients and carries away waste?
A) Nervous system
B) Respiratory system
C) Urinary system
D) Circulatory system
Correct Answer: Circulatory system
Rationale: The circulatory system transports oxygen, nutrients, and waste products throughout the
body. While other systems perform one of these functions, only the circulatory system carries out all the
functions listed above. The nervous system transmits signals, the respiratory system exchanges gases,
and the urinary system filters waste.
2. The pericardial cavity contains which structure?
A) Lungs
B) Heart
C) Descending aorta
D) Circle of Willis
Correct Answer: Heart
Rationale: The pericardial cavity is a fluid-filled space within the pericardium that surrounds the heart. It
contains the heart and provides lubrication to reduce friction during cardiac contractions. The lungs are
in the pleural cavities, and the aorta and Circle of Willis are blood vessels outside this specific space.
3. Which layer of the heart wall is composed primarily of contractile cardiac muscle?
A) Pericardium
,B) Endocardium
C) Myocardium
D) Mediastinum
Correct Answer: Myocardium
Rationale: The myocardium is the thick middle layer of the heart wall consisting of cardiac muscle cells
responsible for the contractile force that pumps blood. The pericardium is the outer sac, the
endocardium lines the inner chambers, and the mediastinum is the anatomical region containing the
heart.
4. What is the purpose of the fossa ovalis in a fetus?
A) It allows blood to flow from the left atrium to the right atrium
B) It allows fetal blood to move directly from the right atrium to the left atrium, bypassing the lungs
C) It connects the pulmonary artery to the aorta
D) It serves as a valve between the ventricles
Correct Answer: It allows fetal blood to move directly from the right atrium to the left atrium, bypassing
the lungs
Rationale: The fossa ovalis is an opening between the atria in the fetal heart that allows blood to bypass
the undeveloped lungs. It closes shortly after birth, forming the fossa ovalis, so that the lungs can
receive oxygen once the baby begins to breathe.
5. Which layer of the heart anchors it to the diaphragm?
A) Endocardium
B) Mediastinal layer
C) Myocardium
D) Pericardium
Correct Answer: Pericardium
, 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.
6. The tough, thick sac that encloses the heart and anchors it to surrounding structures is the:
A) Epicardium
B) Myocardium
C) Fibrous pericardium
D) Serous pericardium
Correct Answer: Fibrous pericardium
Rationale: The fibrous pericardium is the tough, outer layer of the pericardial sac. It anchors the heart to
surrounding structures such as the diaphragm and sternum, providing protection and preventing
overdistension of the heart.
7. The serous membrane that directly covers the heart is called the:
A) Parietal pericardium
B) Visceral pericardium (epicardium)
C) Fibrous pericardium
D) Endocardium
Correct Answer: Visceral pericardium (epicardium)
Rationale: The visceral pericardium, also known as the epicardium, is the innermost layer of the
pericardium that directly covers the heart. The parietal pericardium lines the fibrous pericardium, and
the endocardium lines the heart chambers.
8. Which of the following correctly lists the layers of the heart wall from superficial to deep?
A) Endocardium, myocardium, epicardium
