What is the purpose of intercalated discs in cardiac muscle tissue?
A. Intercalated discs allow atrium or ventricles to contract simultaneously.
B. Intercalated discs allow fast electrical transmission between cells.
C. Both answers are correct.
D. Neither answer is correct.
Answer: C
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Sarah is resting in a chair for a long period of time; her calf and thigh muscles are totally relaxed. Next to her, Priya is also resting in a chair, but she is wiggling, kicking, tapping, and vibrating her legs; resulting in an pattern where her calf and thigh muscles are alternating between relaxed and contracted states. If all else is equal, who has the higher stroke volume, Sarah or Priya?
A. Sarah and Priya have the same stroke volume because they are both seated. B. Sarah has a higher stroke volume. C. Priya has a higher stroke volume. D. No significant difference in the stroke volume between Sarah and Priya can be predicted based on this information.
Parasympathetic innervation of the heart occurs via
A. CN IV. B. CN VI. C. CN VIII. D. CN X. E. CN XII.
Answer the following statements true (T) or false (F)
1. An atom with 15 protons would have an atomic mass of 15. 2. An atom with 15 protons would have an atomic number of 15. 3. An atom with 15 protons and 15 electrons would have an atomic mass of 30. 4. An atom with 15 protons and 15 neutrons would have an atomic mass of 30. 5. Neutrons have no electrical charge.
Which term best describes the concentration gradients for sodium and potassium on an excitable cell?
a. Non-existent b. Steep c. Flat d. Shallow