Answer the following statements true (T) or false (F)
1. During the resting phase of hair growth, the matrix is inactive and the follicle atrophies.
2. The most dangerous skin cancer is cancer of the melanocytes.
3. The skin is not able to receive stimuli because the cells of the epidermis are not living and therefore there are no sensory receptors in the skin.
4. The dermis is rich in blood vessels and nerve fibers.
5. The hypodermis is composed of adipose and dense connective tissue.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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Which of the following become connected by myosin cross-bridges during muscle contraction?
A) thin filaments and thick filaments B) thick filaments and titin filaments C) Z disks and actin filaments D) thick filaments and T tubules E) thin filaments and T tubules
What is the function of bicarbonate when it is secreted by the large intestine?
A. It increases the pH of the feces, which are acidic because of bacterial secretions. B. It aids in the digestion of proteins C. It decreases the pH of feces, which are alkaline because of bacterial secretions. D. It aids in the digestion of cellulose.
Which is not true of filtration and the structures that perform the process?
A. Blood to be filtered enters the renal corpuscle at the vascular pole. B. The capillary endothelium of the glomerulus is fenestrated. C. The visceral wall of the glomerular capsule consists of specialized cells called pedicels. D. The process occurs due to pressure differences across the filtration membrane. E. Filtrate collects in the capsular space before moving to the renal tubule.
Answer the following statement(s) true (T) or false (F)
1. Most neurons have multiple dendrites. 2. Unipolar neurons have only a single process leading away from the soma. 3. Oligodendrocytes serve the same purpose in the CNS that satellite cells do in the PNS. 4. Ependymal cells line the inner cavities of the CNS.