Which of the following proteins is not found as a part of thin filaments?
A) actin
B) tropomyosin
C) troponin
D) nebulin
E) titin
Answer: E
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According to the leading proposal, parturition is initiated by
a. parasympathetic stimulation b. an increase in uterine responsiveness to oxytocin as a result of an increased concentration of myometrial oxytocin receptors c. a drop in oxytocin secretion d. a negative-feedback loop established between progesterone and oxytocin e. a rise in estrogen secretion
Which tissue type is formed from mesoderm?
a. epidermis (outer layer) of skin b. nervous tissue c. smooth muscle tissue d. epithelial lining of the urinary bladder
Which of the following statements apply to the sex chromosomes?
A) They are identified as XY in the female. B) They are numbered pair 23 in the karyotype. C) They contain the same genes as in the other pairs of chromosomes. D) They are found only in the cells in the gonads, the ovaries and testes.
Approximately 0.5% to 1.5% of circulating RBCs are normally:
a) mature eruthrocytes b) proerythroblasts c) reticulocytes d) myeloblasts