14 Questions
Why are multiple tissue types necessary in a whole skeletal muscle?
To enable the muscle to contract and relax effectively
What is the role of acetylcholine (ACh) in muscle cell function?
Triggers muscle contraction by stimulating receptors on the muscle cell membrane
How is endurance exercise different from resistance exercise in their effects on muscle tissue?
Endurance exercises promote increased oxygen utilization in muscles
What is the importance of resting membrane potential (RMP) in muscle cell function?
Allows for generation of action potentials to initiate muscle contractions
Why are small and large motor units different in form and function?
Small motor units produce more force but less precise movements than large motor units
What distinguishes slow twitch fibers from fast twitch fibers?
Fast twitch fibers are rich in myoglobin and mitochondria compared to slow twitch fibers
During long-duration exercise, what leads to fatigue?
Build-up of lactic acid in muscles
Which molecules are crucial for the process of excitation-contraction coupling in muscle cells?
Calcium and troponin
What is the primary difference between small and large motor units?
Large motor units are responsible for fine motor control while small motor units are for gross motor control.
What is the main role of acetylcholine (ACh) in muscle cell function?
Stimulating muscle contraction by depolarizing the muscle cell membrane
Which of the following is a key characteristic of slow twitch muscle fibers?
They have a high resistance to fatigue and are rich in mitochondria
Why is the resting membrane potential (RMP) crucial for muscle cell function?
It maintains the electrical gradient needed for proper muscle cell excitability.
What defines the mechanism that supplies a muscle with ATP based on exercise duration?
The balance between aerobic and anaerobic energy production pathways
How do endurance and resistance exercises differ in their effects on muscle tissue?
Endurance exercises lead to increased mitochondrial density, while resistance exercises promote hypertrophy by increasing myofibril size.
Test your knowledge on the role of the muscular system in whole body homeostasis, tissue types present in a skeletal muscle, parts of a skeletal muscle fiber and their functions, and the steps of excitation, excitation-contraction coupling, and relaxation in muscle cells.
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