Human Anatomy and Physiology : Organs

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

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Example Questions

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.

Example Question #155 : Organs

Which of the following structures does not pass through the jugular foramen?

Possible Answers:

Inferior petrosal sinus

Facial nerve (cranial nerve VII)

Glossopharyngeal nerve (cranial nerve IX)

Sigmoid sinus

Vagus nerve (cranial nerve X)

Correct answer:

Facial nerve (cranial nerve VII)

Explanation:

Cranial nerves IX and X, as well as the inferior petrosal and sigmoid sinuses pass through the jugular foramen, while cranial nerve VII passes through the internal auditory meatus.

Example Question #156 : Organs

Which of the following is not part of the cardiac conduction system?

Possible Answers:

Purkinje cells

Bundle of His

Purkinje fibers

Atrioventricular (AV) node

Sinoatrial (SA) node

Correct answer:

Purkinje cells

Explanation:

Purkinje cells are found in the cerebellum, and are not part of the cardiac conduction system. All other answer choices are part of the cardiac conduction system, which terminates in the Purkinje fibers.

Example Question #157 : Organs

Which layer of the skin does not contain blood vessels?

Possible Answers:

Supradermis

Hypodermis 

None of these

Epidermis

Dermis

Correct answer:

Epidermis

Explanation:

The epidermis does not have direct blood supply; all nutrients that feed cells within the epidermis come from the dermis. The hypodermis lies beneath the dermis and consists of loose connective tissue such as fat. The hypodermic layer also contains blood vessels, lymph vessels, and sweat glands. 

Example Question #158 : Organs

Which nerve does not branch off of a division of the trigeminal nerve?

Possible Answers:

Infratrochlear nerve

Mental nerve

Buccal nerve

Infraorbital nerve

Lesser occipital nerve

Correct answer:

Lesser occipital nerve

Explanation:

The lesser occipital nerve comes from the cervical plexus. The mental and buccal nerves come from the mandibular division of the trigeminal nerve, the infratrochlear nerve comes from the ophthalmic division of the trigeminal nerve, and the infraorbital nerve comes from the maxillary division of the trigeminal nerve.

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