Anemia can be caused by a deficiency of which of the following nutritional substances?
A) calcium and vitamin K
B) magnesium and vitamin C
C) zinc and vitamin A
D) folic acid and vitamin B12
D
Explanation: A) A deficiency of calcium does not cause anemia.
B) A deficiency of magnesium does not cause anemia.
C) A deficiency of zinc does not cause anemia.
D) Correct! Folic acid and vitamin B12 are needed to form erythrocytes.
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Hydantoin drugs for epilepsy prevent the neurons from sending out impulses too rapidly or repeatedly by ________
A) acting on different types of receptors throughout the body B) affecting the flow of sodium in and out of the cell C) depressing the motor cortex of the brain and raising the seizure threshold D) inhibiting the conduction of nerve impulses in the cerebral cortex and motor areas of the brain
The smallest arteries are called:
A) arteriules. B) capillaries. C) arteriums. D) arterioles.
An exogenous antigen is defined as
a. any foreign antigen presented to a T cell b. an alloantigen presented to a B cell c. an antigen that comes from outside the cell and has been engulfed by an antigen-presenting cell d. an antigen that comes from an intracellular bacteria or virus that after digestion replaces the invariant chain
An ________ attack is a respiratory condition that may include chest tightness, wheezing, shortness of breath, and coughing, making exercise more difficult.
Fill in the blank(s) with the appropriate word(s).