Which of the following prevents an erythrocyte from using the oxygen it carries?
A) the lack of a nucleus
B) the lack of mitochondria
C) a biconcave shape
D) the presence of hemoglobin
E) None of the answers are correct.
B) the lack of mitochondria
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Nuclear ____________ are open passageways that penetrate fused regions of the double membrane of the nuclear envelope
Fill in the blank with correct word.
________ stimulates the interstitial cells of the testes to secrete ________.
A. Luteinizing hormone (LH); estrogen B. Follicle-stimulating hormone (FSH); androgen-binding protein (ABP) C. Luteinizing hormone (LH); androgen-binding protein (ABP) D. Gonadotropin-releasing hormone (GnRH); LH E. Luteinizing hormone (LH); testosterone
Which muscle extends the four lateral toes?
A. Fibularis brevis B. Extensor hallicus longus C. Tibialis anterior D. Extensor digitorum longus E. Soleus
Valves similar to the semilunar valves of the heart are found in medium and large ________.
A. venules B. arterioles C. capillaries D. arteries E. veins