What cell types are targeted by cytotoxic T cells?
A. cancer cells and virally infected cells.
B. all antigen-bearing cells.
C. T cells.
D. cytotoxic cells.
Answer: A
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Indicate whether this statement is true or false.
Which of the following statements concerning oogenesis is correct?
a. After menopause there are still many primary follicles in the ovary b. Polar bodies are larger than the ovum c. The second meiotic division occurs prior to fertilization d. Just before ovulation, the primary oocyte completes its first meiotic division e. The primary oocyte within a primary follicle is haploid cell.
During quiet breathing, the diaphragm and external intercostals muscles contract. What effect does this have on the thoracic cavity?
a. it increase the pressure and decreases the volume of the thoracic cavity b. it increases the volume and decreases the pressure of the thoracic cavity c. it increases the volume and increases the pressure of the thoracic cavity d. it decreases the volume and decreases the pressure of the thoracic cavity
What is the connective tissue that surrounds the entire muscle?
A. Fascia B. Perimysium C. Endomysium D. Epimysium