The movement of oxygen from the alveoli of the lungs into the bloodstream is an example of
A. osmosis.
B. active transport.
C. bulk transport.
D. facilitated diffusion.
E. diffusion.
E
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What is the function of a lymphocyte's coreceptors?
A. Bind to other lymphocytes to attack pathogens B. Initiate mitosis to generate memory lymphocytes C. Monitor pH of interstitial fluids D. Recognize particular antigens E. Produce antibodies
A man in his fifties notices a slight soreness of the cheek near his first upper right molar. Over the next several days the condition becomes much worse and is accompanied by swelling of the cheek and more than normal dryness of the mouth. What is the cause of this problem, how can it be treated, and what potentially serious problem could arise from the method of treatment?
What will be an ideal response?
In a sarcomere, cross-bridge attachment occurs specifically in the
A) A band B) H band C) zone of overlap D) I band E) M line
Which of the following is derived from ectoderm?
A. lens of the eye B. thymus gland C. tonsils D. urinary bladder E. dermis of skin