__________________alert immune cells of the presence of a pathogen
Fill in the blank with the correct word.
Answer: Antigen-presenting cells
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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
If a normal cell is placed into an unknown solution and it shrinks, what can be concluded about the unknown solution?
A. Its nonpenetrating solute concentration is greater than that of a normal cell. B. Its nonpenetrating solute concentration is less than that of a normal cell. C. Its nonpenetrating solute concentration is equal to that of a normal cell. D. Its penetrating solute concentration is less than that of a normal cell. E. Its penetrating solute concentration is greater than that of a normal cell.
Which of the following is NOT involved in short-term regulation of blood pressure?
A. baroreceptor reflex B. adrenal medullary mechanism C. alteration in blood volume D. chemoreceptor mechanism
What is a major function of the clavicle?
A. It provides attachment for the humerus. B. It stabilizes the sternum. C. It keeps the upper limb away from the midline of the body. D. It prevents the trapezius muscle from pulling the shoulders posteriorly. E. Ligaments between the clavicle and humerus limit shoulder joint movement.