IdeasCuriosas - Every Question Deserves an Answer Logo

In Biology / College | 2025-07-05

Which muscle fiber type is primarily involved in endurance activities such as marathon running?
A. Type lla (fast-twitch, oxidative) fibers.
B. Hybrid fibers that contain characteristics of both Type I and Type Il fibers.
C. Type I (slow-twitch) fibers.
D. Type llb (fast-twitch, glycolytic) fibers.

Asked by jnorton1024

Answer (2)

The muscle fiber type primarily involved in endurance activities like marathon running is Type I (slow-twitch) fibers. These fibers are fatigue-resistant and optimized for aerobic metabolism, making them suitable for long-duration exercise. They rely on oxygen for energy, which supports sustained activity. ;

Answered by GinnyAnswer | 2025-07-05

The muscle fiber type mainly involved in endurance activities like marathon running is Type I (slow-twitch) fibers. These fibers are optimized for aerobic metabolism, allowing for sustained energy use. Type II fibers, in contrast, are more suited for short bursts of activity and fatigue more quickly.
;

Answered by Anonymous | 2025-07-08

Related Questions in Biology

[Answered] A) Constitutive Perhaps 60-80% of genes are not regulated, but are C) Degenerative D) Repressed B) Continuous

[Answered] Which statement about the scientific method is true? A. The scientific method involves developing and testing conclusions. B. The scientific method is a linear approach to accumulating scientific knowledge. C. The scientific method is used in different ways by different scientists. D. The scientific method involves developing a question to answer a hypothesis.

[Answered] What characteristic of skeletal muscle fibers allows them to contract and move bones? A) The presence of thick and thin myofilaments organized into sarcomeres. B) The fibrous epimysium surrounding the fibers. C) The rich supply of blood vessels in skeletal muscle. D) The multinucleated structure of the fibers.

[Answered] Through which conversion is energy released? A. ADP to ATP B. ATP to ADP C. NADP${}^{+}$ to NADPH D. $CO _2$ and $H _2 O$ to $C _6 H _{12} O _6$ and $O _2$

[Answered] The regulation of the lactose operon depends on the level of which of the following substances in the medium? A) DNA polymerase B) RNA polymerase C) Lactose D) Glucose E) C & D