Which of the Following Statements Are True of Ejection Fraction

question 7

Multiple Choice

Which of the following statements are true of ejection fraction?
I.It is a measure of ventricular contractility.
II.The heart's normal ejection fraction is approximately 60% of the end-diastolic volume under resting conditions.
III.The heart's normal ejection fraction is approximately 90% of the end-diastolic volume in strenuous exercise.
IV.The heart's normal ejection fraction is approximately 80% of the end-diastolic volume under resting conditions.

• A) I, II
• B) I, III, IV
• C) I, II, III, IV
• D) I, II, III

---

Definitions:

Deep Sleep

A stage of sleep characterized by slow brain waves, known as delta waves, indicating a state of low consciousness and minimal physiological activity.

Older Adults

Individuals typically aged 65 years and older, often characterized by increased life experience and, for some, changes in physical and cognitive capacities.

Pineal Gland

A small endocrine gland in the vertebrate brain, often associated with the secretion of melatonin, regulating sleep patterns.

Melatonin

A hormone produced by the pineal gland that regulates sleep-wake cycles and tells the body when it's time to sleep.