The testicular cells that construct the blood-testis barrier are the ________.
A) spermatocytes
B) spermatogonia
C) sustentacular cells
D) interstitial cells
C) sustentacular cells
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A collection of air or gas in the thoracic cavity, as the result of a stab wound or gunshot wound to the chest describes a condition called ________
A) Pneumoconiosis B) Pneumothorax C) Bronchiectasis D) Emphysema
Damage to the AV node could cause ________ on and ECG.
A. the absence of the T wave B. multiple P waves C. multiple Q waves D. multiple T waves
The optic disc
A. is located in the vascular tunic. B. is the site of greatest visual acuity. C. is also called the macula lutea. D. is on the anterior surface of the eye. E. contains no photoreceptor cells.
Which statement is false regarding T cells?
A. THelper cells activate macrophages for nonspecific defenses like inflammation and fever. B. In cellular immunity THelper cells recognize what is foreign and release interleukin-1 to get TCytotoxic cells to clone themselves and attack. C. In humoral immunity, THelper cells first recognize what is foreign and then release interleukin-2 to have B cells react by cloning themselves and producing antibodies. D. All of these statements are true.