Which statement is incorrect?
a. The Y chromosome stimulates production of SRY protein by primitive gonadal cells.
b. Ovaries must be present for feminization of the reproductive tract and external genitalia to occur.
c. H-Y antigen directs differentiation of the primitive gonads into testes.
d. Secretion of testosterone and Müllerian inhibiting factor by the fetal testes induces development of the reproductive tract and external genitalia along male lines.
e. Early in development, embryos of both sexes have the same indifferent reproductive tissues capable of differentiating into either a male or female reproductive system depending respectively on the presence or absence of masculinizing factors.
B
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The decrease in blood pressure upon standing is known as ________.
Fill in the blank(s) with the appropriate word(s).
Parathyroid hormone stimulates the activity of bone-resorbing osteoblasts
Indicate whether the statement is true or false
Troponin
A. has two subunits. B. binds to ATP. C. is a long, flexible protein. D. is part of the myosin myofilament. E. has a calcium-binding site.
What occurs immediately before an electrical signal travels along the sarcolemma?
A. Calcium binds to troponin. B. Calcium is released from the sarcoplasmic reticulum. C. Acetylcholine diffuses across the synaptic cleft. D. Acetylcholine binds to its receptors.