About 55% of whole blood is ____, which is mostly made up of water.
white blood cells
Disulfide bonds are most characteristic of which of the following levels of protein structure?
none of the above
Skin becomes less flexible as individual ages because of a decrease in the number of protein fibers associated with the dermis.
Red-green color blindness is an X-linked recessive disorder. Assume that mom is a carrier and dad is color blind. What is the chance that their son will inherit red-green color blindness?
Human cells, with the exception of the gametes, reproduce by mitosis.
A student noticed that every time he smelled a certain perfume in the hallway, it reminded him of his mother. This is due largely to the activity of the limbic system.
Bulk movement of water across plasma membranes and the exchange of oxygen from blood into cells are similar in that the method of transport is by
Excitatory neurotransmitters encourage the generation of new electrical impulses by
stimulating saltatory conduction.
stimulating depolarization of postsynaptic neurons.
inhibiting postsynaptic neurons from repolarizing.
inhibiting presynaptic neurons from depolarizing.
stimulating depolarization of presynaptic neuorons
Which of the following is not true regarding pneumonia?
It is caused by the bacterium Mycobacterium tuberculosis.
Symptoms include fever, cough, and shortness of breath.
It ranks among the top 10 causes of death in North America.
It can be caused by a viral infection.
Symptoms result from inflammation of the lungs and secretion of excess fluid by the alveoli.
Vasoconstriction causes an increase in the diameter of blood vessels, thus causing an increase in blood flow to the tissues.