What bony arrangement would most effectively resist forces associated with weight bearing?
A. Trabeculae arranged in a random fashion permeated with large marrow spaces
B. Lamellae of compact bone with collagen fibers arranged in tightly coiled helices
C. Lamellae of compact bone with collagen fibers arranged in bundles parallel to the long axis of the diaphysis
D. A diaphysis consisting of compact bone surrounded by a layer of trabecular bone
E. Epiphyses with numerous spicules of bone that are randomly arranged
B. Lamellae of compact bone with collagen fibers arranged in tightly coiled helices
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The medullary cardiovascular center is the only part of the brain involved with the regulation of blood pressure
Indicate whether the statement is true or false.
The shaft of a long bone is called the
A) epiphysis. B) trabecula. C) canaliculus. D) diaphysis. E) lamella.
Draw graphs showing the effect on action potentials in a cell following effective doses of each of the listed neurotoxins. Assume that the cell is normally brought to threshold by an electrical stimulus applied to it, so that any abnormality is due to the toxin. Precise values for voltage and duration are not important, just a general trend in how the action potential may be different from normal.
1. puffer fish poison (blocks voltage -gated sodium channel activation) 2. tetraethylammonium (blocks voltage -gated potassium channels) 3. ouabain (blocks sodium-potassium pumps) 4. sea anemone toxin (blocks voltage -gated sodium channel inactivation)
The stomach bed is formed by structures forming the posterior wall of the omental bursa except from:
A. Spleen B. Spenic artery C. Left lobe of the liver D. Left dome of the diaphragm E. Left kidney