Which of the following does NOT have an effect on the amount of muscle tension that results from a muscle contraction?
a. the size of the motor units in the muscle
b. how frequently the motor units are stimulated
c. the type of bone to which the muscle is attached
d. the number of motor units active at one time
Answer: c. the type of bone to which the muscle is attached
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What do you think would result if nitrogen-fixing cyanobacteria populations suddenly declined?
A. Aquatic primary production would decline, particularly in regions not subject to fertilizer runoff. B. Legumes would cease to grow, but other types of plants would be unaffected. C. Both the aquatic and terrestrial populations of autotrophs would collapse. D. Populations of denitrifying bacteria would expand to take over their role, creating only a temporary disruption. E. More nitrogen would become available for other aquatic autotrophs.
A sigmoidoscopy is used to screen for ____________________. Fill in the blank(s) with the appropriate word(s)
For a species with four pairs of chromosomes, ________ chromosome combinations are possible
A) 4 B) 8 C) 16 D) 20
Cutaneous receptors are classified as interoceptors. These specialized skin receptors can respond to which of the following stimuli?
A. Heat, cold, and light B. Heat, cold, pain, touch, and pressure C. Heat, cold, pain, pressure, light, and sound D. Pain, pressure, and sound E. Chemicals, light, and sound