The part of the eye with the highest concentration of cones is the:
a. macula lutea
b. fovea centralis
c. optic disc
d. choroid layer
b. fovea centralis
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External respiration involves the
A) movement of air into and out of the lungs. B) diffusion of gases between the interstitial fluid and the external environment. C) exchange of dissolved gases between the cells and interstitial fluids. D) binding of oxygen by hemoglobin. E) utilization of oxygen by tissues to support metabolism.
How can a single axon respond to several different kinds of events?
What will be an ideal response?
Sympathetic activation leads to
A) relaxation in skeletal muscle of bronchioles, causing bronchodilation. B) contraction of smooth muscles of bronchioles, causing bronchoconstriction. C) relaxation in smooth muscles of bronchioles, causing bronchodilation. D) relaxation of smooth muscles of bronchioles, resulting in bronchoconstriction. E) contraction of smooth muscles of bronchioles, causing bronchodilation.
Having venous blood from the intestines flow through the liver before entering the systemic circulation has the following advantages: ________
A) the anatomical position of the liver makes it simpler for intestinal blood to flow through it rather than around it to get to the inferior vena cave B) the liver can release insulin based on the amount of sugars it finds in the intestinal blood C) the liver can store nutrient rich blood for emergency needs of the body D) the liver can process products of digestion before blood circulates to the whole body