The union of ovum and sperm during fertilization creates the first cell of the new organism, which is called a
A. morula.
B. zygote.
C. zona pellucida.
D. blastocyst.
Answer: B
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The flow rate of blood through an organ is in part determined by the relative dilation or constriction of arterioles in that organ.
Answer the following statement true (T) or false (F)
Why is the skin capable of repair, even after serious damage?
A) All layers of the skin have an excellent blood supply. B) Stem cells persist in both the epidermis and dermis. C) Individual skin cells have a high metabolic rate. D) There are abundant fibroblasts in the epidermis. E) Construction of scar tissue is easier than making normal skin.
Melatonin is a _______________.
a. sleeping pill b. depressant c. stimulant d. hormone
Insulin
a. facilitates the entry of glucose into brain tissue. b. promotes glucose output by the liver. c. lowers blood glucose levels. d. both facilitates the entry of glucose into brain tissue and lowers blood glucose levels are correct. e. all of these answers.