As a result of playing tennis in the summer heat without proper hydration, you have become very dehydrated. You are now in hypernatremia, a condition where your blood sodium levels are too high. Your brain tells you to drink water and, as a result, your blood sodium and hydration levels go back to normal. This illustrates
A) positive feedback.
B) stimulus reinforcement.
C) negative feedback.
D) diagnostic regulation.
E) both positive and negative feedback loops.
C) negative feedback.
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The portal vein is formed by the merger of the splenic vein and SMV.
Answer the following statement true (T) or false (F)
This figure shows an intestinal villus. The structure indicated by number 3 is a
A. submucosal gland. B. Brunner gland. C. lymphatic nodule. D. plicae circulares. E. mucous gland.
Growth hormone
a. directly stimulates bone growth b. exerts its effects on bones via somatomedin release c. promotes closure of the epiphyseal plate d. does both a and c e. does both b and c
The "kissing muscle" that purses the lips is the
A) zygomaticus major. B) orbicularis oris. C) buccinator. D) levator labii superioris. E) procerus.