High levels of estrogen directly stimulate the LH-secreting cells of the anterior pituitary
Indicate whether the statement is true or false
T
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Humans have selectively bred many radically different domestic animals. (For example, think of St. Bernard and chihuahua dogs.) Does this activity result in evolution? Why or why not?
What will be an ideal response?
Match the chemical signal with the appropriate description.A. Chemicals produced by neurons that function as hormonesB. Chemicals that act locally on nearby cellsC. Chemical secreted by presynaptic terminalD. Influences same cell type from which it is secretedE. Chemical secreted into blood by specialized cells; travels some distance to target tissuesParacrine
Fill in the blank(s) with the appropriate word(s).
Some people suffer involuntary urination due to incompetence of what muscle?
A) External urethral sphincter B) Levator ani C) Compressor urethrae D) Bulbospongiosus E) Ischiocavernosus
The microscopic cylindrical-shaped unit of compact bone is called ________
A) The endosteum B) The osteon C) The trabeculae D) The cancellous