What are the three types of muscle tissue?

Skeletal muscle is voluntary and striated, responsible for body movement. • Cardiac muscle is involuntary, striated, and found only in the heart. • Smooth muscle is involuntary and non-striated, found in organs like the stomach and blood vessels.

What is the main function of skeletal muscle?

The primary function of skeletal muscle is movement of the skeleton by contracting and pulling on bones. It also helps maintain posture, stabilize joints, and generate heat.

Which muscle type contains intercalated discs and why are they important?

Cardiac muscle contains intercalated discs, which allow electrical impulses to pass quickly between cells, ensuring that the heart contracts as a coordinated unit.

What is a motor unit?

A motor unit consists of one motor neuron and all the muscle fibers it innervates. It determines how precise or powerful a muscle contraction can be — smaller motor units allow for fine movements, larger ones for powerful contractions.

What is the role of calcium in muscle contraction?

Calcium ions (Ca²⁺) bind to troponin, causing tropomyosin to shift and expose binding sites on actin. This allows myosin heads to attach and perform the power stroke that contracts the muscle.

What molecule provides energy for muscle contraction?

Adenosine triphosphate (ATP) provides the energy. ATP allows the myosin heads to detach from actin and “re-cock” for another contraction cycle.

What is the difference between isotonic and isometric contractions?

Isotonic contractions involve movement (muscle changes length, like lifting a weight). • Isometric contractions involve tension without movement (muscle length stays the same, like holding a plank).

What is muscle tone and why is it important?

Muscle tone is the slight, continuous contraction of muscles even at rest. It’s important for posture, joint stability, and readiness to respond to stimuli.

What happens during muscle fatigue?

Muscle fatigue occurs when muscles can no longer contract effectively due to ATP depletion, lactic acid buildup, and ion imbalances, leading to decreased performance

What is the sliding filament theory?

The sliding filament theory explains how muscles contract: myosin filaments slide past actin filaments, shortening the sarcomere — the basic unit of a muscle fiber — and causing the entire muscle to contract.

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Anatomy

Question	Answer
What are the three types of muscle tissue?	Skeletal muscle is voluntary and striated, responsible for body movement. • Cardiac muscle is involuntary, striated, and found only in the heart. • Smooth muscle is involuntary and non-striated, found in organs like the stomach and blood vessels.
What is the main function of skeletal muscle?	The primary function of skeletal muscle is movement of the skeleton by contracting and pulling on bones. It also helps maintain posture, stabilize joints, and generate heat.
Which muscle type contains intercalated discs and why are they important?	Cardiac muscle contains intercalated discs, which allow electrical impulses to pass quickly between cells, ensuring that the heart contracts as a coordinated unit.
What is a motor unit?	A motor unit consists of one motor neuron and all the muscle fibers it innervates. It determines how precise or powerful a muscle contraction can be — smaller motor units allow for fine movements, larger ones for powerful contractions.
What is the role of calcium in muscle contraction?	Calcium ions (Ca²⁺) bind to troponin, causing tropomyosin to shift and expose binding sites on actin. This allows myosin heads to attach and perform the power stroke that contracts the muscle.
What molecule provides energy for muscle contraction?	Adenosine triphosphate (ATP) provides the energy. ATP allows the myosin heads to detach from actin and “re-cock” for another contraction cycle.
What is the difference between isotonic and isometric contractions?	Isotonic contractions involve movement (muscle changes length, like lifting a weight). • Isometric contractions involve tension without movement (muscle length stays the same, like holding a plank).
What is muscle tone and why is it important?	Muscle tone is the slight, continuous contraction of muscles even at rest. It’s important for posture, joint stability, and readiness to respond to stimuli.
What happens during muscle fatigue?	Muscle fatigue occurs when muscles can no longer contract effectively due to ATP depletion, lactic acid buildup, and ion imbalances, leading to decreased performance
What is the sliding filament theory?	The sliding filament theory explains how muscles contract: myosin filaments slide past actin filaments, shortening the sarcomere — the basic unit of a muscle fiber — and causing the entire muscle to contract.

Created by: Ronaldar1978

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