Biology ยท General Awareness

Muscle Biology

798 Questions

Muscle biology covers the structures, functions, and contraction mechanisms of skeletal, cardiac, and smooth muscles. Test questions target filaments, stimuli, and specific muscle roles. A clear understanding helps secure marks in biology sections.

Skeletal muscle controlCardiac muscle propertiesMuscle contraction mechanismActin and myosin filamentsMuscle functions

Muscle Biology Questions

Multiple choice

Which of the following is a type of muscle contraction in which the muscle lengthens and generates force?

  1. Isometric contraction

  2. Concentric contraction

  3. Eccentric contraction

  4. Isotonic contraction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In an eccentric contraction, the muscle lengthens while generating force. This type of contraction is commonly observed during muscle deceleration and is responsible for controlling movement and preventing injury. Eccentric contractions play a crucial role in activities such as running, jumping, and lifting weights.

Multiple choice

What is the pathophysiology of myasthenia gravis?

  1. Autoimmune destruction of nicotinic acetylcholine receptors on muscle cells

  2. Defective release of acetylcholine from motor neurons

  3. Impaired reuptake of acetylcholine from the synaptic cleft

  4. Degeneration of muscle fibers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Myasthenia gravis is an autoimmune disorder in which antibodies are produced that attack and destroy nicotinic acetylcholine receptors on muscle cells, leading to muscle weakness and fatigue.

Multiple choice

Which neurotransmitter is primarily responsible for muscle contraction?

  1. Acetylcholine

  2. Dopamine

  3. Glutamate

  4. GABA
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acetylcholine is the primary neurotransmitter involved in muscle contraction, facilitating communication between motor neurons and muscles.