(Q).
Q: What kind of muscle cells undergo twitch-type contractions with long refractory periods followed by brief relaxation periods, allowing the heart to fill with blood for the next cycle? Choices: - nervous muscle - skeletal muscle - smooth muscle - cardiac muscle A:
(A).
cardiac muscle

(Q).
Q: Where do stratus clouds occur in the troposphere? Choices: - mid to high region - high - mid-region - low A:
(A).
low

(Q).
Q: Through what system of the body do hormones generally travel? Choices: - respiratory - endocrine - excretory - circulatory system A:
(A).
circulatory system