Which two strata of the epidermis are most susceptible to cancer?
A. Stratum spinosum and stratum basale
B. Stratum lucidum and stratum granulosum
C. Stratum granulosum and stratum spinosum
D. Stratum corneum and stratum lucidum
E. Stratum basale and stratum corneum
Answer: A
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Some fish have the ability to keep certain parts of their body warm by the use of retia. Retia are
A) Countercurrent heat exchangers. B) Found in locomotor muscles of certain species of large fish, such as tuna and lamnid sharks. C) Special adipose cells that generate heat. D) A and B
Which statement does not apply to macrophages?
a. They participate in inflammation. b. They process and present antigens to lymphocytes. c. They secrete antibodies. d. They secrete interleukin 1. e. They participate in immune surveillance against cancer.
Lymphocytes respond to antigens that have been processed and presented to them by
a. neutrophils b. eosinophils c. an APC d. helper T cells e. interleukin 2
How many organ systems make up the human body?
A) 9 B) 10 C) 11 D) 12