Chapter 43 described an important experiment by Otto Loewi that demonstrated the existence of chemical neurotransmitters. Loewi used frog hearts in dishes that exhibited a regular heartbeat even when disconnected from the rest of the body. This experiment would not have been possible if these hearts lacked
A) sinoatrial nodes.
B) atrioventricular nodes.
C) neurogenic pacemakers.
D) cardiogenic pacemakers.
E) atrioventricular valves.
Correct Answer:
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Q10: The primary function served by erythrocytes is
A)
Q11: During cellular maturation, mammalian erythrocytes lose their
A)
Q12: Reduced levels of hemoglobin in the blood
Q13: Hemophilia results from a deficiency in
A) platelets.
B)
Q14: In the final reaction of the blood
Q16: If a human red blood cell takes
Q17: The spread of an action potential through
Q18: If you hold a stethoscope to your
Q19: What is the reason why fluid is
Q20: The primary determinant of blood flow to
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