Half of the fibers of each optic nerve decussate at the __________.
A. superior colliculus
B. optic chiasm
C. lateral geniculate nucleus of the thalamus
D. optic foramen
E. midbrain
B. optic chiasm
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A(n) ____________________ is the alternating expansion and contraction of an artery as blood flows through it.?
Fill in the blank(s) with correct word
What is the average energy expenditure for an active man not engaged in heavy manual labor?
A. 2900 kcal/day B. 3200 kcal/day C. 2100 kcal/day D. 2500 kcal/day
Which of the following situations would represent a serious disruption of the homeostasis of the volume and composition of body fluids?
1. Eating a normal meal and drinking a glass of water 2. Normal urination 3. Sweating on a warm day, but drinking lemonade in the shade afterwards 4. Drinking a sports drink after playing a game of basketball with friends 5. Becoming dehydrated as your lifeboat drifts on the empty ocean
which of the following statements are true regarding introns? select all that apply.
a) an intron is a portion of mRNA that does not code for protein b) an intron is a portion of mRNA that must be removed before translation c) an intron is a portion of mRNA that undergoes translation in the cytoplasm