Which labeled structure in the figure acts as the natural pacemaker of the heart?
a) A
b) B
c) C
d) D
e) E
a
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Psyche is a Greek word meaning _______
A. essence B. sout C. behavior D. love
The initial effect of a stimulus on a sensory receptor is a local electrical change specifically called a(an) ________.
A. local potential B. action potential C. sensory potential D. receptor potential E. graded potential
Which of the following is NOT a leading cause of atherosclerosis?
A. Low-level bacterial or viral infections B. High LDL cholesterol C. Smoking D. Hypotension
Positive feedback includes ________.
A. secretion of insulin in response to increased blood glucose B. secretion of glucagon in response to decreased blood glucose C. sweating in response to elevated body temperature D. uterine contractions in response to the pressure of the baby's head on the cervix E. All of the other answers are examples of negative feedback