Amphioxus obtains its oxygen by diffusion over the body surface. Why aren't vertebrates generally able to do this that is, why do most aquatic vertebrates rely on gills for gas exchange?
What will be an ideal response?
First, vertebrates are bigger than amphioxus. Thus their surface area (the area for diffusion) is smaller in relation to their volume (which determines the metabolic needs) and the amount of oxygen they could obtain via diffusion might not meet their demands. Second, vertebrates are more active than amphioxus, and activity increases the rate of oxygen consumption. Put these two facts together, and you can see the need for a more specialized system in vertebrates.
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At the synapse, synaptic vesicles are found in the
A) postsynaptic cell. B) presynaptic cell. C) synaptic cleft. D) all of the above
Which of the following is true regarding the elimination of clots?
A. The process of dissolving clots is called anticoagulation. B. Plasmin is changed to plasminogen to help dissolve the clot. C. The process of dissolving clots is called fibrinolysis. D. The clot is necessary once a vessel has healed.
Define necrotic
What will be an ideal response?
The serous membrane that covers the exposed surfaces of enclosed organs such as the liver and stomach is called the
A) pleura. B) peritoneum. C) pericardium. D) perichondrium. E) periosteum.