Senescence of the immune system makes older people more susceptible to cancer and infectious disease because of a decline in ________
A) antigen-presenting cells and helper T cells
B) alpha and beta globulins
C) prothrombin and fibrinogen
D) red blood cells and platelets
E) complement proteins
A
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The nerve responsible for innervation (movement) of the quadriceps femoris muscle is the ________ nerve.
A. tibial B. sciatic C. genitofemoral D. obturator E. femoral
Which layer of the epidermis contains layers of flattened keratinocytes that are going through apoptosis?
a) Stratum basale b) Stratum spinosum c) Stratum granulosum d) Stratum lucidum e) Stratum corneum
Describe the function of the medullary cavity
A) The medullary cavity contains compact bone lamella oriented for strength. B) The medullary cavity contains spongy bone oriented along lines of stress. C) The medullary cavity is a fibrous membrane containing blood vessels, lymphatic vessels, and sensory nerves. D) The medullary cavity contains cartilage that allows long bones to get longer. E) The medullary cavity contains the red bone marrow and the yellow bone marrow.
A bird hits the windshield of your car, and you reflexively duck and close your eyes. Which of the following is responsible for this action?
A. medulla B. superior colliculi C. reticular formation D. thalamus E. cerebellum