The trachea splits into _______ main stem bronchi?
A. One
B. Two
C. Three
D. Four
Answer: B. Two
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Label R represents which of the following structures?
A) hilum
B) renal pelvis
C) renal cortex
D) renal medulla
E) renal sinus
Which of the following statements is true about the endocrine system?
A) The endocrine system is larger in the elderly. B) The endocrine system is one of the few systems that is unaffected by diet and exercise. C) Its function stays constant as a person ages. D) The use of anabolic steroids can damage the endocrine system.
Sustained fevers that are 1 ° C above normal core body temperature usually lead to irreversible brain damage
Indicate whether this statement is true or false.
What type of chemical messenger is released from neurons to activate an adjacent cell?
A. paracrine B. neurotransmitter C. autocrine D. endocrine