Mastering NSG 530 Exam 2: 100
Essential Questions&Answers
Covering Cardiovascular, Respiratory,
Oncology & More
CARDIOVASCULAR SYSTEM
1. What is the primary pacemaker of the heart?
Answer: Sinoatrial (SA) node
Rationale: The SA node is located in the right atrium and sets the
heartbeat rate. It generates electrical impulses that cause the atria to
contract and establishes the normal sinus rhythm. The autonomic
nervous system modulates its rate, with the sympathetic nervous
system increasing and the parasympathetic nervous system
decreasing firing rate .
2. What is the correct sequence of the cardiac conduction system?
Answer: SA node → AV node → Bundle of His → Purkinje fibers
Rationale: The impulse originates in the SA node, travels to the AV
node where it is delayed to allow ventricular filling, then passes
through the Bundle of His and bundle branches, finally reaching the
, Purkinje fibers which distribute the impulse throughout the ventricular
myocardium .
3. What factor determines systolic blood pressure?
Answer: The volume of blood ejected from the left ventricle into the
aorta and aortic compliance
Rationale: Systolic pressure is the maximum aortic pressure achieved
during left ventricular contraction. It is influenced by stroke volume,
the force of ventricular contraction, and the compliance or stiffness of
the aorta. Aortic stiffness from aging or disease increases systolic
pressure .
4. What is diastolic blood pressure?
Answer: The lowest pressure in the aorta, occurring just before
ventricular ejection
Rationale: Diastolic pressure reflects the pressure in the aorta during
ventricular relaxation and filling. It represents the minimum pressure
in the arterial system and is determined primarily by peripheral
vascular resistance .
5. What is pulse pressure and what is its normal range?
, Answer: The difference between systolic and diastolic pressures;
normally 40-50 mmHg
Rationale: Pulse pressure reflects the force of ventricular contraction
and the compliance of the aorta. A widened pulse pressure may
indicate aortic stiffness or regurgitation, while a narrowed pulse
pressure may suggest decreased stroke volume or increased
peripheral resistance .
6. What are the three layers of blood vessels?
Answer: Intima, Media, Adventitia
Rationale: The intima is the innermost layer lined with endothelium.
The media is the middle layer containing smooth muscle and elastic
fibers that regulate vessel diameter. The adventitia is the outermost
connective tissue layer that provides structural support .
7. What is the formula for cardiac output?
Answer: CO = Heart Rate × Stroke Volume
Rationale: Cardiac output is the volume of blood pumped by the
heart per minute. It is influenced by preload, afterload, contractility,
and heart rate. Changes in any of these factors affect cardiac output
and tissue perfusion .
, 8. Describe the Renin-Angiotensin-Aldosterone System (RAAS).
Answer: A coordinated system of hormones that regulates blood
pressure and water balance
Rationale: Decreased blood pressure or reduced renal perfusion
causes juxtaglomerular cells in the kidneys to release renin. Renin
converts angiotensinogen (inactive) to angiotensin I, which is then
converted to angiotensin II by ACE. Angiotensin II causes
vasoconstriction and stimulates aldosterone secretion, leading to
sodium and water retention, increasing blood volume and pressure .
9. Where does conversion of angiotensin I to angiotensin II occur?
Answer: In the blood; ACE is produced in the lungs
Rationale: Angiotensin-converting enzyme (ACE) is primarily found in
the pulmonary capillaries. When angiotensin I passes through the
lungs, ACE converts it to the active form angiotensin II. This is why
ACE inhibitors are effective in managing hypertension and heart
failure .
10. What are the two types of chemoreceptors that control
respiration?
Answer: Central chemoreceptors and peripheral chemoreceptors
Rationale: Central chemoreceptors are located in the medulla and
respond primarily to changes in cerebrospinal fluid pH (CO₂ levels).
Peripheral chemoreceptors are located in the carotid and aortic
Essential Questions&Answers
Covering Cardiovascular, Respiratory,
Oncology & More
CARDIOVASCULAR SYSTEM
1. What is the primary pacemaker of the heart?
Answer: Sinoatrial (SA) node
Rationale: The SA node is located in the right atrium and sets the
heartbeat rate. It generates electrical impulses that cause the atria to
contract and establishes the normal sinus rhythm. The autonomic
nervous system modulates its rate, with the sympathetic nervous
system increasing and the parasympathetic nervous system
decreasing firing rate .
2. What is the correct sequence of the cardiac conduction system?
Answer: SA node → AV node → Bundle of His → Purkinje fibers
Rationale: The impulse originates in the SA node, travels to the AV
node where it is delayed to allow ventricular filling, then passes
through the Bundle of His and bundle branches, finally reaching the
, Purkinje fibers which distribute the impulse throughout the ventricular
myocardium .
3. What factor determines systolic blood pressure?
Answer: The volume of blood ejected from the left ventricle into the
aorta and aortic compliance
Rationale: Systolic pressure is the maximum aortic pressure achieved
during left ventricular contraction. It is influenced by stroke volume,
the force of ventricular contraction, and the compliance or stiffness of
the aorta. Aortic stiffness from aging or disease increases systolic
pressure .
4. What is diastolic blood pressure?
Answer: The lowest pressure in the aorta, occurring just before
ventricular ejection
Rationale: Diastolic pressure reflects the pressure in the aorta during
ventricular relaxation and filling. It represents the minimum pressure
in the arterial system and is determined primarily by peripheral
vascular resistance .
5. What is pulse pressure and what is its normal range?
, Answer: The difference between systolic and diastolic pressures;
normally 40-50 mmHg
Rationale: Pulse pressure reflects the force of ventricular contraction
and the compliance of the aorta. A widened pulse pressure may
indicate aortic stiffness or regurgitation, while a narrowed pulse
pressure may suggest decreased stroke volume or increased
peripheral resistance .
6. What are the three layers of blood vessels?
Answer: Intima, Media, Adventitia
Rationale: The intima is the innermost layer lined with endothelium.
The media is the middle layer containing smooth muscle and elastic
fibers that regulate vessel diameter. The adventitia is the outermost
connective tissue layer that provides structural support .
7. What is the formula for cardiac output?
Answer: CO = Heart Rate × Stroke Volume
Rationale: Cardiac output is the volume of blood pumped by the
heart per minute. It is influenced by preload, afterload, contractility,
and heart rate. Changes in any of these factors affect cardiac output
and tissue perfusion .
, 8. Describe the Renin-Angiotensin-Aldosterone System (RAAS).
Answer: A coordinated system of hormones that regulates blood
pressure and water balance
Rationale: Decreased blood pressure or reduced renal perfusion
causes juxtaglomerular cells in the kidneys to release renin. Renin
converts angiotensinogen (inactive) to angiotensin I, which is then
converted to angiotensin II by ACE. Angiotensin II causes
vasoconstriction and stimulates aldosterone secretion, leading to
sodium and water retention, increasing blood volume and pressure .
9. Where does conversion of angiotensin I to angiotensin II occur?
Answer: In the blood; ACE is produced in the lungs
Rationale: Angiotensin-converting enzyme (ACE) is primarily found in
the pulmonary capillaries. When angiotensin I passes through the
lungs, ACE converts it to the active form angiotensin II. This is why
ACE inhibitors are effective in managing hypertension and heart
failure .
10. What are the two types of chemoreceptors that control
respiration?
Answer: Central chemoreceptors and peripheral chemoreceptors
Rationale: Central chemoreceptors are located in the medulla and
respond primarily to changes in cerebrospinal fluid pH (CO₂ levels).
Peripheral chemoreceptors are located in the carotid and aortic
