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

Anatomy & Physiology

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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.

Anatomy & Physiology

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.

Anatomy & Physiology

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).

Anatomy & Physiology

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.

Anatomy & Physiology