Which type of muscle fibers contain more myofibrils in parallel? Afast glycolytic Bslow oxidative Which type of muscle fibers have a greater blood supply (more capillaries)? Afast glycolytic Bslow oxidative Muscle hypertrophy refers to _______ while muscle atrophy refers to _______. A"an increase in muscle strength and diameter, a decrease in muscle strength and diameter" B"an increase in the number of motor units in a muscle, a decrease in the number of motor units in a muscle" C"the effect of rest on muscle cells, the effect of endurance exercise on muscle cells" Dall of the above are correct

Answered: Which type of muscle fibers contain…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Which type of muscle fibers have a greater blood supply (more capillaries)?

	A	fast glycolytic
	B	slow oxidative

Muscle hypertrophy refers to _______ while muscle atrophy refers to _______.

	A	"an increase in muscle strength and diameter, a decrease in muscle strength and diameter"
	B	"an increase in the number of motor units in a muscle, a decrease in the number of motor units in a muscle"
	C	"the effect of rest on muscle cells, the effect of endurance exercise on muscle cells"
	D	all of the above are correct

Expert Solution

Step 1

A basic unit of the muscle cell that is rod-like in shape is called myofibrils. They help in the regulation of muscle growth. The sarcoplasmic reticulum covered the myofibrils in the muscle fibers along with the tubules.

Step 2

The fast glycolytic muscle fiber consists of more myofibrils in parallel because fast glycolytic muscle fibers help in doing the powerful movements and strong muscle contraction which provides high ATP hydrolysis and initiates the cross-bridge formation. The fast glycolytic muscle fiber contains a higher ratio that is used in providing power to the muscles which will in turn increase the myofibrils formation and diameter of the muscle fibers.

Hence, the correct option is A.