Which does NOT apply to hormones?
A. They are chemical regulators that are conveyed from one organ to another via the bloodstream.
B. In some cases, the same chemical substances can also function as local regulators and/or neurotransmitters.
C. All hormones are derived from cholesterol.
D. They are secreted into the blood by ductless glands.
E. They are sometimes secreted by neural tissue.
C
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Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?
A. Susan's uninjured muscles overcompensate for the inactive ones by contracting spontaneously. B. Susan was more cold than usual because her inactivity prevented her muscles from helping to regulate her body temperature. C. Susan's metabolic rate was raised, and it initiated sweating.
Which part of the humerus articulates with the radius?
A. Trochlea B. Greater tubercle C. Lesser tubercle D. Capitulum
John Musick and Julia Ellis have proposed that the ancestral reproductive mode for elasmobranchs was "yolk-sac viviparity
" That is, embryos were retained throughout their development in the oviducts of the female and emerged as miniatures of the adults (i.e., viviparity), but nutrition was provided by yolk that was deposited at the time the egg was formed, not from the mother during development (i.e., lecithotrophy, not matrotrophy). They suggest that oviparity (depositing eggs that develop outside the body of the mother) was associated with the evolution of small body size because it increased the fecundity of small species of elasmobranchs. What is their reasoning? That is, why would oviparity provide greater fecundity than viviparity for small species of elasmobranchs? What other factors might make one mode superior to the other?
A(n) ________ is a rigid structure that moves on a fixed point
A) action B) insertion C) origin D) fulcrum E) lever