Summarize the composition of blood plasma
What will be an ideal response?
Blood plasma is approximately 90 percent water and forms the liquid part of blood. Examples of some of the many substances dissolved in plasma are nutrients, salts (electrolytes), respiratory gases, hormones, plasma proteins, and various wastes and products of cell metabolism.
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What emerging science studies environmentally induced modifications of a gene's activity that do not involve a change in the gene's DNA code?
a. gene modification theory b. epigenetics c. geneticology d. modified genetics e. intragenetics
Which statement is characteristic of the endocrine system?
a. it is considered "wireless" b. utilizes neurotransmitters c. is effective over short distances d. has a rapid response e. coordinates precise responses
Changes called male climacteric are a consequence of a(n) ________
A) decreased secretion of testosterone B) increased secretion of progesterone C) increased secretion of FSH and LH D) increased secretion of GnRH E) increased secretion of estrogens
How do Sertoli cells protect the developing sperm? What do they do exactly?
What will be an ideal response?