The biogenic amine, __________, is important for invertebrates as a neurotransmitter
A) Epinephrine
B) Norepinephrine
C) Thyroid hormone
D) Octopamine
Fill in the blank with the correct answer.
Answer: D
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The plateau phase seen during the action potential of a cardiac muscle cell is due to the
A. sodium-potassium pump. B. opening of sodium channels. C. continuing to have open calcium channels. D. closure of chloride channels. E. closing of calcium channels.
Identify the following
Answer the following statements true (T) or false (F)
1. The ears are lateral to the nose. 2. The heart is medial to the lungs. 3. The skin is superficial to the ribs. 4. The lungs are deep to the ribs. 5. The bones of the arm are superficial to the muscles of the arm.
During the contraction phase of a muscle twitch,
A. the action potential travels down the T tubule. B. actin-myosin cross-bridges form. C. acetylcholine stimulates the pre-synaptic terminal. D. Ca2+ are transported back to the sarcoplasmic reticulum. E. Na+ diffuse into the muscle fiber.