How do melanocytes and keratinocytes work together to protect the skin from UV damage?
A) Keratinocytes maintain the appropriate temperature so the melanin will not denature.
B) Keratinocytes accumulate melanin granules to shield the keratinocyte's DNA.
C) Keratinocytes provide the melanocyte with nutrients critical for melanin synthesis.
D) Keratinocytes maintain the proper pH for melanocytes to synthesize melanin granules.
Answer: B
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Extensions from megakaryocytes that extend through blood vessel walls in red marrow are sliced off from the cells by the force of blood flow. These extensions are
A. reticulocytes. B. promegakaryocytes. C. myeloid stem cells. D. late erythroblasts. E. proplatelets.
The kidneys do not play a vital role in which of these functions?
a. maintaining blood pressure b. stimulating red blood cell production c. acid-base balance d. the kidney plays a vital role in all of the above functions
Arrange the following events so that they indicate a possible metabolic sequence the body might use to interconvert a protein to a lipid.1. Glycerol and three fatty acids combine to form triglycerides.2. Fatty acids are formed from acetyl CoA.3. Protein is digested to release amino acids.4. Amino acids are converted to acetyl CoA.
A. 2, 4, 3, 1 B. 4, 2, 3, 1 C. 2, 3, 4, 1 D. 3, 4, 2, 1 E. 4, 3, 2, 1
Like skeletal muscle cells, cardiac muscle cells have an absolute refractory period prior to repolarization.
Answer the following statement true (T) or false (F)