When a muscle contraction occurs:
a. the actin gets shorter
b. the myosin gets shorter
c. the Z-lines are pulled closer together
d. both A and B
c. the Z-lines are pulled closer together
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During development, the ________ system forms most of the veins of the head, neck, and body wall.
Fill in the blank(s) with the appropriate word(s).
A patient's karyotype indicates a chromosome number of 45. This result is best explained by
A. nondisjunction in either the sperm cell or oocyte. B. fertilization of a single oocyte by two sperm cells. C. a point mutation that caused one or more chromosomes to fuse. D. nondisjunction in both the sperm cell and oocyte.
When considering leverage, the part of the bone from the muscle attachment to the joint would be the
A. fulcrum. B. resistance arm. C. effort arm.
Define visceral reflex
A) A visceral reflex is a slow, calculated response of the spinal cord following exposure to a single specific somatic stimulus. B) A visceral reflex is a slow, calculated response of the spinal cord following repeated exposure to specific somatic stimuli. C) A visceral reflex is an autonomic reflex initiated in the viscera. It can be modified, facilitated, or inhibited by higher centers, especially those in the hypothalamus. D) A visceral reflex is an automatic response to a somatic stimulus that is controlled in the spinal cord and can function without input from the brain. E) A visceral reflex is when visceral sensory inputs are sent quickly by the spinal cord to the brain for analysis before any response occurs.