Question

Of the following statements about the muscle tissue of cruising and lunging fish, which is/are true? Choose all that apply.

a) Cruising fish rely more on red muscle fibers.
b) Lunging fish primarily use white muscle fibers.
c) Red muscle fibers are more fatigue-resistant.
d) Cruising fish engage white muscle fibers for burst acceleration.

Answer 1

Red muscle fibers are more fatigue-resistant and primarily used by cruising fish for extended endurance. White muscle fibers are used by lunging fish for burst acceleration.

Step-by-step explanation:

Of the given statements, the true statements about the muscle tissue of cruising and lunging fish are:

a) Cruising fish rely more on red muscle fibers because red muscle fibers are dense with capillaries and mitochondria, which allows them to carry oxygen and sustain aerobic activity for prolonged periods.

b) Lunging fish primarily use white muscle fibers because white muscle fibers are less dense in mitochondria and myoglobin and can contract more quickly and with more force, but can only sustain short, anaerobic bursts of activity.

c) Red muscle fibers are indeed more fatigue-resistant compared to white muscle fibers because of their ability to sustain aerobic activity for extended periods.

d) Cruising fish engage red muscle fibers for extended endurance rather than white muscle fibers for burst acceleration.