Biology Test Biology Human Anatomy & Physiology 4

Question 1

Which cranial nerve is responsible for the majority of parasympathetic innervation of the thoracic and abdominal organs?

Accepted Answer

Vagus nerve (X)

Answer

The vagus nerve (CN X) provides parasympathetic innervation to the heart, lungs, and most abdominal organs.

Question 2

Osteoblasts are responsible for which primary bone function?

Accepted Answer

Bone formation and matrix secretion

Answer

Osteoblasts synthesize and secrete the organic bone matrix (osteoid) and facilitate its mineralization.

Question 3

Which blood vessel carries oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary vein

Answer

The pulmonary veins are unique among veins in carrying oxygenated blood, returning it from the lungs to the left atrium.

Question 4

The conversion of fibrinogen to fibrin during blood clotting is catalyzed by which enzyme?

Accepted Answer

Thrombin

Answer

Thrombin cleaves fibrinogen into fibrin monomers, which polymerize to form the stable clot mesh.

Question 5

Which structure connects the hypothalamus to the posterior pituitary gland and transports hormones like ADH and oxytocin?

Accepted Answer

Axons of hypothalamic neurons

Answer

Axons of supraoptic and paraventricular hypothalamic neurons travel to the posterior pituitary to release ADH and oxytocin.

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