Most of the calcium that triggers contraction of cardiac muscle comes
A. into the cell through leakage channels in the sarcolemma.
B. from the Golgi apparatus of the cell.
C. into the cell through voltage-gated channels in the sarcolemma.
D. from the sarcoplasmic reticulum of the cell.
Answer: D
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If excess water enters the body,
A. osmoreceptors in the brain swell. B. more water is reabsorbed from the renal tubules. C. ADH release increases. D. the collecting duct becomes more permeable to water.
Refer to Table 1.3 and the bar graph.
A. Write a hypothesis regarding the effects of breakfast consumption on reaction time.
B. What is the dependent variable? What is the independent variable?
Identify the statement that best differentiates gray matter and white matter
A. Gray matter consists of bundles of axons and white matter consists of groups of cell bodies and dendrites. B. Gray matter consists of all parts of neurons and white matter is mostly glial cells. C. Gray matter consists of cell bodies and dendrites whereas white matter consists mostly of myelinated axons
Arrange the following to reflect the correct sequence an action potential would follow to reach the olfactory cortex of the brain:
(1) olfactory bulb (2) olfactory cortex (3) olfactory epithelium (4) olfactory tract A. 1, 2, 3, 4 B. 3, 4, 1, 2 C. 1, 4, 2, 3 D. 3, 1, 4, 2 E. 4, 3, 2, 1