What part of the retina absorbs light and prevents it from scattering inside the eye?
A) choroid
B) neural layer
C) photoreceptors
D) vascular layer
E) pigmented layer
E
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This area houses the body's "internal thermostat"
a. hypothalamus. b. cerebellum. c. skin. d. cerebral cortex. e. medulla.
What prevents the dramatic increase in venous return that occurs during exercise from damaging the cardiac myocytes?
A. The exercise demand on the heart causes it to stiffen, preventing overstretch. B. The pericardium acts as a limit on the amount of stretch. C. The increased heart rate limits filling time. D. Venous return is not sufficient to stretch the heart very much.
When chyme enters the duodenum, ____ is released and stimulates the pancreas to secrete bicarbonates
A. gastrin B. secretin C. insulin D. cholecystokinin E. glucagon
Sperm lack a(n) ________.
A. nucleus B. mitochondria C. endoplasmic reticulum D. flagellum