Approximately 80% of a muscle fiber's volume are the myofibrils. This characteristic reflects muscles ability to ________
A) store oxygen molecules that can be used in aerobic respiration
B) produce relatively high amounts of ATP
C) produce movement through contractile force
D) generate and propagate action potential
C
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Superior phrenic arteries supply the ________ and emerge from the ________.
A. pancreas; descending abdominal aorta B. diaphragm; descending thoracic aorta C. diaphragm; descending abdominal aorta D. esophagus; descending thoracic aorta E. stomach; descending abdominal aorta
Hemoglobin in blood, collagen in tendons, and enzymes in the digestive system are all examples of
A. proteins.?B. lipids.?C. amino acids.?D. carbohydrates.?E. catalysts.
When light strikes a photoreceptor it
A. deporlarizes and releases more neurotransmitter. B. depolarizes and releases less neurotransmitter. C. hyperpolarizes and releases more neurotransmitter. D. hyperpolarizes and releases less neurotransmitter.
The white communicating ramus carries which of the following?
A. Sympathetic postganglionic fibers to the effector organs B. Sympathetic preganglionic fibers to a sympathetic chain ganglion C. Parasympathetic preganglionic fibers from the dorsal root to a spinal nerve D. Sympathetic preganglionic fibers to a spinal nerve E. Sympathetic postganglionic fibers to a spinal nerve