Which of the following is a physiological response that takes place in many animals when they get too hot?
A) slowing of the heart rate
B) constriction of blood vessels in the skin
C) contraction of muscles
D) increased blood flow to the skin
D
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Signaling by the steroid hormone estrogen is an example of _______ signaling.
a. autocrine b. endocrine c. paracrine d. direct cell-to-cell
Which of the following statements about gap junctions is false?
(a) Gap junctions are made of connexons. (b) Molecules up to 1000 daltons in molecular mass can move across gap junctions. (c) Because gap junctions do not allow ions to pass through, they are not used for electrically coupling cells. (d) Gap junctions can close in response to extracellular signals.
When the placenta is delivered, what event allows secretion of prolactin and milk production?
A. a surge of adrenaline and endorphins B. sudden drop in progesterone and estradiol C. gradual drop in oxytocin D. sudden rise in FSH and LH
Using the Linnaean system of nomenclature, corn is named Zea mays. What is the specific epithet in this name?
a. Zea mays b. Zea c. mays d. Quercus e. corn