Which blood vessels carry blood away from the heart?
A) arteries
B) veins
C) capillaries
A
Explanation:
B) Veins carry blood back toward the heart.
C) Capillaries link arteries and veins and are the site of gas and nutrient exchange in the tissues.
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Which of the following statements most accurately describes hypoxia?
A. An increase in the amount of dissolved oxygen in plasma or air B. An increase in the amount of dissolved carbon dioxide in plasma or air C. A decrease in the amount of dissolved carbon dioxide in plasma or air D. A decrease in the amount of dissolved oxygen in plasma or air
Which of the following is correct regarding the occipital lobe?
A. It is the principal visual center of the brain. B. It is likely to play a role in understanding spoken language. C. It is the primary site for receiving and interpreting signals from the general senses. D. It is chiefly concerned with mood, memory, and emotions. E. It is concerned with voluntary motor functions.
What is an expatriate?
A. a former citizen of a country B. someone whose allegiance to his/her nation is questioned C. a person who works in another country D. a person who returns from having worked in another country
The following are the main steps in the generation of an action potential
1. Sodium channels are inactivated. 2. Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization. 3. Sodium channels regain their normal properties. 4. A graded depolarization brings an area of an excitable membrane to threshold. 5. A temporary hyperpolarization occurs. 6. Sodium channel activation occurs. 7. Sodium ions enter the cell and depolarization occurs. What is the proper sequence of these events? A) 4, 6, 7, 3, 2, 5, 1 B) 4, 6, 7, 1, 2, 3, 5 C) 6, 7, 4, 1, 2, 3, 5 D) 2, 4, 6, 7, 1, 3, 5 E) 4, 2, 5, 6, 7, 3, 1