The hormones known as "catecholamines" (adrenaline, noradrenaline, and dopamine) are not lipid-soluble. Therefore their receptor sites are:
On the inside of the plasma membrane
On the outside of the plasma membrane
in the cell cytoplasm
in the cell nucleus
The Correct Answer is B
a) On the inside of the plasma membrane: Catecholamines cannot cross the lipid bilayer, so they cannot bind to internal membrane receptors.
b) On the outside of the plasma membrane: Because catecholamines are water-soluble, they bind to extracellular receptors that initiate a second messenger cascade (e.g., cAMP).
c) In the cell cytoplasm: Only lipid-soluble hormones, like steroids, bind to intracellular receptors.
d) In the cell nucleus: Again, only lipid-soluble hormones (like thyroid hormones or steroids) reach nuclear receptors.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
a) It is transported to the liver and becomes part of the bile: This applies to bilirubin, a byproduct of heme, not iron.
b) It is converted into stercobilin and gives color to feces: Stercobilin is derived from bilirubin, not iron.
c) It is used to synthesize proteins: While iron is important in protein function, its primary fate is recycling for hemoglobin.
d) It attaches to transferrin and is transported to bone marrow for use in hemoglobin synthesis. Iron is bound to transferrin in the blood and transported to the bone marrow for new red blood cell (hemoglobin) synthesis.
Correct Answer is B
Explanation
a) Hemoglobin: Hemoglobin is the oxygen-carrying protein inside RBCs, measured in grams per deciliter.
b) Hematocrit: Hematocrit is the percentage of whole blood volume made up by red blood cells (RBCs). It's used to assess anemia or polycythemia.
c) Erythropoietin: This is a hormone (mostly from the kidneys) that stimulates RBC production in the bone marrow.
d) Erythrocyte sedimentation rate: This test measures how quickly RBCs settle in a test tube, used as a nonspecific marker for inflammation.
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