Which lymphatic cells are large lymphocytes that attack and destroy bacteria transplanted tissue, host cells infected with viruses or that have turned cancerous.
a. Natural killer (NK) cells.
b. T lymphocytes (T cells).
c. B lymphocytes (B cells).
d. All of the above.
Answer: Natural Killer Cells
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Which of the following represents the largest and most complex level of structural organization in the human body?
a) chemical level b) cellular level c) tissue level d) organ level e) organismal level
Describe an action potential and explain why a region of the membrane that is in the absolute refractory period cannot experience another action potential until repolarization is complete. Include the following in your answer : voltage-gated Na+ channels, voltage-gated K+ channels, activation gate, inactivation gate, threshold voltage, increasing membrane potential, and decreasing membrane
potential. What will be an ideal response?
Which accessory gland secretes a thick, yellowish fluid that contains sugar and other carbohydrates to nourish sperm, and a protein that will help semen adhere to the vaginal walls?
A. Bulbourethral B. Seminal vesicle C. Glans penis D. Prostate
From which artery is a person able to feel his or her pulse?
A) internal carotid artery B) common carotid artery C) facial artery D) maxillary artery