Human Anatomy and Physiology : Gross Anatomy

Study concepts, example questions & explanations for Human Anatomy and Physiology

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Example Questions

Example Question #147 : Organs

What vein carries blood to the lungs directly from the right ventricle?

Possible Answers:

Right pulmonary artery

Left pulmonary artery

Pulmonary trunk

Aorta

Left common carotid artery

Correct answer:

Pulmonary trunk

Explanation:

While it is true that the left and right pulmonary arteries carry blood to the lungs, it is the pulmonary trunk that receives blood directly from the right ventricle because the pulmonary trunk then branches into the left and right pulmonary arteries. The aorta carries blood from the left ventricle to the systemic circulation. The left common carotid artery branches off the brachiocephalic trunk, which itself branches off the aortic arch.

Example Question #148 : Organs

What vein most directly drains blood from the cheeks, lips, and nose?

Possible Answers:

External jugular vein

Facial vein

Internal jugular vein

Posterior auricular vein

Correct answer:

Facial vein

Explanation:

The facial vein is responsible for draining the blood from the cheeks, lips, and nose. The posterior auricular vein drains blood from behind the ears. The internal jugular vein drains blood from the brain, face, and scalp (the facial vein drains into the internal jugular vein). The external jugular vein drains blood from the face and scalp. Both jugular veins drain into the subclavian vein.

Example Question #149 : Organs

Which artery supplies the mouth and nose?

Possible Answers:

Superficial temporal

Carotid

Axillary

Maxillary

Correct answer:

Maxillary

Explanation:

The maxillary artery supplies blood to the mouth and nose. The axillary artery is located near the armpit and does not supply the head with blood. The carotid supplies most of the tissues of the head, but divides into branches, and most of its blood is taken to the brain. The superficial temporal artery supplies the top and sides of the head. 

Example Question #624 : Gross Anatomy

What cranial nerve carries visual information to the brain?

Possible Answers:

IV

II

I

III

Correct answer:

II

Explanation:

Cranial nerve (CN) II is also known as the optic nerve, which carries visual stimuli to the brain. CN I is the olfactory nerve and it allows for the detection of odors. CN III is the oculomotor nerve, which allows the eyeball to move. CN IV is the trochlear nerve, which helps rotate the eye inferiorly and laterally. 

Example Question #151 : Organs

Which artery supplies blood to the head and neck?

Possible Answers:

Internal jugular

Superior vena cava

Common carotid

Brachial

Correct answer:

Common carotid

Explanation:

The common carotid is an artery that supplies blood to the head and neck. The internal jugular is the vein that drains blood from the head and neck. The brachial artery provides blood to the arm. The superior vena cava is a large vein that returns blood to the heart from the head and arms. 

Example Question #151 : Organs

Which of the following blood vessels most directly drains the legs?

Possible Answers:

Femoral artery

Pulmonary trunk

Inferior vena cava

Great saphenous vein

Correct answer:

Great saphenous vein

Explanation:

The great saphenous vein is responsible for draining the blood from the legs. The femoral artery supplies blood to the legs. The inferior vena cava returns blood from the legs and abdomen to the heart. The pulmonary trunk bifurcates into the right and left pulmonary arteries, which bring oxygen-poor blood to the lungs, where it becomes oxygenated.

Example Question #152 : Organs

What is a lumen?

Possible Answers:

The inside of the intestines only

The interior of any hollow organ

The inside of a blood vessel only

The inside of the lung only

Correct answer:

The interior of any hollow organ

Explanation:

The interior of any hollow organ is called its lumen. A lumen may be completely or partially filled with air or fluid. All of the answer choices are specific examples of lumens.

Example Question #152 : Organs

Which cranial nerve is the trigeminal nerve?

Possible Answers:

I

V

VI

XI

Correct answer:

V

Explanation:

The trigeminal nerve is cranial nerve (CN) V, it has both sensory and motor functions including sensation of the face and scalp, and control of the muscles of mastication. CN XI is the accessory nerve, which has only motor functions, and innervates the muscles of the lateral and posterior neck. CN VI is the abducens nerve, which is a motor nerve that innervates the lateral rectus and controls eye movements. CN I is the olfactory nerve and involves the sense of olfaction.

Example Question #153 : Organs

Someone with an injury to the posterior cord of the brachial plexus would likely present with weakness to which of the following muscles?

Possible Answers:

Biceps brachii

Lumbricals III and IV

Triceps brachii

Serratus anterior

Flexor carpi ulnaris

Correct answer:

Triceps brachii

Explanation:

The triceps brachii is innervated by the radial nerve, which comes from the posterior cord of the brachial plexus. Accordingly, damage to the posterior cord would disrupt function of the triceps brachii, among other muscles. Lumbricals III and IV, and the flexor carpi ulnaris are innervated by the ulnar nerve, which comes from the medial cord of the brachial plexus. The biceps brachii is innervated by the musculocutaneous nerve, which comes from the lateral cord of the brachial plexus. The serratus anterior is innervated by the long thoracic nerve, which is a pre-plexus nerve.

Example Question #154 : Organs

Which of the following does not supply blood to the myocardium of the heart?

Possible Answers:

Left coronary artery

Circumflex artery

Right coronary artery

Coronary sinus

Left anterior descending artery

Correct answer:

Coronary sinus

Explanation:

All of the arteries listed, are coronary arteries, or branches of coronary arteries, which supply blood to the myocardium. The coronary sinus is a group of veins, so it drains blood from the myocardium, rather than supplying it.

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