The direction of blood flow through the heart is best described by which of these?

Aorta- right atrium right ventricle lungs pulmonary vein→ left atrium → left ventricle → vena cava

Vena cava- right atrium - right ventricle - lungs - pulmonary artery - left atrium - left ventricle

Right atrium → right ventricle → pulmonary vein→ lungs → pulmonary artery → left atrium → left ventricle

Right atrium → right ventricle → pulmonary artery → lungs pulmonary vein→ left atrium → left ventricle

Answer and Explanation

The Correct Answer is D

A. Aorta- right atrium-right ventricle-lungs-pulmonary vein→ left atrium→ left ventricle→ vena cava: This sequence is incorrect because blood does not flow from the aorta to the right atrium; rather, the aorta carries oxygenated blood from the left ventricle to the body. The vena cava brings deoxygenated blood into the right atrium.

B. Vena cava-right atrium-right ventricle-lungs-pulmonary artery-left atrium-left ventricle: This sequence is incorrect because the blood does not flow from the lungs directly into the left atrium via the pulmonary artery; instead, blood from the lungs returns to the left atrium via the pulmonary veins.

C. Right atrium → right ventricle → pulmonary vein → lungs → pulmonary artery → left atrium → left ventricle: This sequence is incorrect because the pulmonary veins carry oxygenated blood from the lungs to the left atrium, not to the right ventricle.

D. Right atrium → right ventricle → pulmonary artery → lungs → pulmonary vein → left atrium → left ventricle: This is the correct sequence of blood flow through the heart. Blood flows from the right atrium to the right ventricle, then to the pulmonary artery, which carries it to the lungs for oxygenation. After oxygenation, blood returns to the left atrium via the pulmonary veins and then flows into the left ventricle before being pumped out to the body through the aorta.

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Correct Answer is C

Explanation

A. II: The optic nerve (cranial nerve II) is responsible for vision, including visual acuity and the afferent limb of the pupillary reflex. Damage to this nerve causes vision loss or visual field defects but does not affect eye movement or positioning.

B. VI: The abducens nerve (cranial nerve VI) innervates the lateral rectus muscle, which abducts the eye. Damage to this nerve results in an inability to move the eye laterally, leading to horizontal diplopia, but it does not cause a "down and out" eye position.

C. III: The oculomotor nerve (cranial nerve III) controls most of the extraocular muscles, including the superior, inferior, and medial rectus muscles, as well as the inferior oblique. It also controls the levator palpebrae superioris and the parasympathetic fibers responsible for pupillary constriction. Damage to cranial nerve III results in ptosis, a "down and out" eye position due to unopposed action of the lateral rectus (cranial nerve VI) and superior oblique (cranial nerve IV), and potentially a dilated pupil.

D. IV: The trochlear nerve (cranial nerve IV) innervates the superior oblique muscle, which depresses and internally rotates the eye. Damage to this nerve typically causes vertical diplopia and difficulty looking downward, especially when reading or descending stairs, but it does not cause a "down and out" eye position at rest.

A. pericardial sac B. endocardial sac C. pleural sac D. myocardial sac

Correct Answer is A

Explanation

A. Pericardial sac: The pericardial sac, also known as the pericardium, is a double-walled sac that surrounds and protects the heart. It consists of an outer fibrous layer and an inner serous layer, which produces pericardial fluid to reduce friction between the heart and surrounding structures during heartbeats. This structure provides support and helps maintain the position of the heart within the thorax.

B. Endocardial sac: The endocardium is the innermost layer of the heart wall that lines the heart chambers and covers the heart valves. It does not refer to a protective sac surrounding the heart.

C. Pleural sac: The pleural sac consists of two layers (visceral and parietal pleura) that encase the lungs and provide a lubricated surface for lung expansion and contraction during respiration. It is not related to the heart.

D. Myocardial sac: The myocardium refers to the muscular middle layer of the heart wall responsible for contraction and pumping blood. It is not a sac and does not surround or protect the heart.

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The direction of blood flow through the heart is best described by which of these?

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