PCAT Anatomy 4

Question 1

Which valve prevents backflow of blood from the aorta into the left ventricle?

Accepted Answer

Aortic semilunar valve

Answer

The aortic semilunar valve closes during ventricular diastole to prevent backflow of blood from the aorta into the left ventricle.

Question 2

The glomerulus is located within which structure of the nephron?

Accepted Answer

Bowman's capsule

Answer

The glomerulus, a tuft of capillaries, is encased within Bowman's capsule (glomerular capsule) at the beginning of the nephron.

Question 3

Which structure connects the middle ear to the nasopharynx?

Accepted Answer

Eustachian tube

Answer

The Eustachian (pharyngotympanic) tube connects the middle ear to the nasopharynx, equalizing pressure across the tympanic membrane.

Question 4

The brachioradialis muscle is innervated by which nerve?

Accepted Answer

Radial nerve

Answer

Despite acting as a forearm flexor, the brachioradialis is innervated by the radial nerve, making it an exception among forearm flexors.

Question 5

Which type of cartilage makes up the intervertebral discs?

Accepted Answer

Fibrocartilage

Answer

Fibrocartilage, which contains abundant collagen fibers, forms the annulus fibrosus of intervertebral discs and withstands compressive forces.

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