What prevents the trachea from collapsing?
A. The C-shaped cartilaginous rings
B. The surrounding muscles
C. The internal epithelium
D. The internal air pressure within the trachea
E. Nothing, it pulsates (expands and contracts) with each breath.
Answer: A
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Which of the following statements best describes how humans are infected by the malaria parasite?
A) In the hemolymph of the mosquito, the gametocytes mature, migrate to the salivary glands, and are injected into the host when the mosquito feeds. B) In the mosquito's digestive tract the parasite produces oocysts, which migrate to the salivary glands, and are injected into the host when the mosquito feeds. C) In the mosquito's digestive tract the parasite produces gametocytes, which migrate to the salivary glands, and are injected into the host when the mosquito feeds. D) In the mosquito's digestive tract the parasite develops into infective sporozoites, which travel to the salivary glands, and are injected into the host when the mosquito feeds.
The rocks found in one's head (calcium carbonate crystals) are called ________.
Fill in the blank(s) with the appropriate word(s).
Control of food intake is primarily a function of the hypothalamus
Indicate whether the statement is true or false
When sodium channels are fully open, the membrane of the ventricular cardiocyte ________
A) sharply depolarizes B) sharply repolarizes C) plateaus D) sharply hyperpolarizes E) has no response