A person struggling with a stressful exam question might experience difficulty focusing her eyes on the paper because:
A. she suddenly develops presbyopia.
B. activation of her parasympathetic nerves causes sudden contraction of her ciliary muscles.
C. activation of her sympathetic nerves causes sudden contraction of her ciliary muscles.
D. activation of her parasympathetic nerves inhibits contraction of her ciliary muscles.
E. activation of her sympathetic nerves inhibits contraction of her ciliary muscles.
E
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The neurotransmitter between muscle cells and the nervous system cells is _____.?
A) ?epinephrine B) ?acetylcholine C) ?norepinephrine
Sex hormones produced by the ovaries and testes ________
A) are protein hormones B) are controlled by hormones produced by the adrenal medulla C) promote the formation of sex cells D) are produced in equal amounts in both males and females E) are secreted in response to posterior pituitary hormones
When extreme temperature changes a protein's shape so much that it can no longer perform its usual function, that change is known as __________.
Fill in the blank with correct word.
The total number of phalanges in the body is:
a. 14 b. 28 c. 56 d. 84