What type of endocrine signaling is used predominantly by invertebrates?
a. autocrine signaling
b. paracrine signaling
c. classical endocrine signaling
d. neuroendocrine signaling
e. no endocrine signaling
d
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Which of the following is true of both T cells and B cells?
A. They are effector cells against specific pathogens. B. They are produced from stem cells of the bone marrow. C. They can help attack and destroy invading pathogens. D. They typically have a short life span. E. All of these statements are true.
People with a large amount of which tissue are
least likely to be sensitive to cold? a. cartilage b. adipose c. blood d. dense connective e. bone
Enzymes affect the reactions in living cells by changing the
a) products of the reaction b) speed of the reaction c) temperature of the reaction d) pH of the reaction
An emergency room physician has withdrawn blood from a vessel in your arm. The dark red color of the blood indicates that it was
A) on its way to the tissues of the arm. B) going away from the heart. C) coming from the lungs. D) taken from a vein. E) taken from an artery.