A tough, fibrous connective tissue that attaches muscle to bone. Tendons transmit the force generated by muscles to move the skeleton.

Voluntary muscles attached to bones that produce body movements.

Involuntary muscle found only in the heart, responsible for pumping blood.

Involuntary muscle found in the walls of internal organs (like the stomach and blood vessels) that helps move substances through the body.

The basic unit of muscle contraction; made of actin and myosin filaments.

Sarcoplasmic Reticulum

Stores and releases calcium ions (Ca²⁺) needed for muscle contraction.

Calcium Ions (Ca²⁺)

Trigger muscle contraction by binding to troponin on actin filaments.

Thin filaments that slide past myosin during muscle contraction.

Thick filaments that pull on actin to shorten the muscle.

A protein that binds calcium and helps start muscle contraction.

A protein that blocks actin’s binding sites until calcium binds to troponin.

Adenosine Triphosphate (ATP)

The energy source used for muscle contraction and relaxation.

Skeletal Muscle Diagram

A labeled picture showing muscle fibers, sarcomeres, actin, myosin, and tendons.

The outermost connective tissue layer that surrounds the entire muscle.

The connective tissue that wraps bundles of muscle fibers called fascicles.

A bundle of muscle fibers (cells).

he connective tissue surrounding each individual muscle fiber.

Muscle Fiber (Muscle Cell)

A single, elongated muscle cell; contains many nuclei and myofibrils.

Rodlike structures within muscle fibers; composed of sarcomeres, which contain actin and myosin filaments responsible for muscle contraction.

the 6 rules that say what is and isn't a muscle

Muscles must have at least two points of attachment — an origin and an insertion.

The attachment that moves during contraction is the insertion; the attachment that remains stationary is the origin.

Muscles must cross at least one joint to cause movement at that joint.

Muscles work in opposing pairs: Flexor – decreases the angle of a joint. Extensor – increases the angle of a joint.

Muscles can only pull (contract) — they cannot push.

Visible striations (lines in skeletal muscle) show the direction of muscle contraction.

The inability of a muscle to maintain force or contraction due to lack of ATP, accumulation of lactic acid, or depletion of energy stores.

A recording of electrical activity produced by skeletal muscles; used to diagnose muscle or nerve disorders.

A sustained, maximal muscle contraction resulting from rapid, repeated stimulation without relaxation between stimuli.

Help

Options

focusNode

Didn't know it?
click below

Knew it?
click below

Don't Know

Remaining cards (0)

Know

retry

shuffle

restart

0:00

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Vocab 1.2 - Muscles

Term	Definition
Tendon	A tough, fibrous connective tissue that attaches muscle to bone. Tendons transmit the force generated by muscles to move the skeleton.
Skeletal Muscle	Voluntary muscles attached to bones that produce body movements.
Cardiac Muscle	Involuntary muscle found only in the heart, responsible for pumping blood.
Smooth Muscle	Involuntary muscle found in the walls of internal organs (like the stomach and blood vessels) that helps move substances through the body.
Sarcomere	The basic unit of muscle contraction; made of actin and myosin filaments.
Sarcoplasmic Reticulum	Stores and releases calcium ions (Ca²⁺) needed for muscle contraction.
Calcium Ions (Ca²⁺)	Trigger muscle contraction by binding to troponin on actin filaments.
Actin Filaments	Thin filaments that slide past myosin during muscle contraction.
Myosin Filaments	Thick filaments that pull on actin to shorten the muscle.
Troponin	A protein that binds calcium and helps start muscle contraction.
Tropomyosin	A protein that blocks actin’s binding sites until calcium binds to troponin.
Adenosine Triphosphate (ATP)	The energy source used for muscle contraction and relaxation.
Skeletal Muscle Diagram	A labeled picture showing muscle fibers, sarcomeres, actin, myosin, and tendons.
Epimysium	The outermost connective tissue layer that surrounds the entire muscle.
Perimysium	The connective tissue that wraps bundles of muscle fibers called fascicles.
Fascicle	A bundle of muscle fibers (cells).
Endomysium	he connective tissue surrounding each individual muscle fiber.
Muscle Fiber (Muscle Cell)	A single, elongated muscle cell; contains many nuclei and myofibrils.
Myofibril	Rodlike structures within muscle fibers; composed of sarcomeres, which contain actin and myosin filaments responsible for muscle contraction.
6 Rules of Muscles	the 6 rules that say what is and isn't a muscle
1	Muscles must have at least two points of attachment — an origin and an insertion.
2	The attachment that moves during contraction is the insertion; the attachment that remains stationary is the origin.
3	Muscles must cross at least one joint to cause movement at that joint.
4	Muscles work in opposing pairs: Flexor – decreases the angle of a joint. Extensor – increases the angle of a joint.
5	Muscles can only pull (contract) — they cannot push.
6	Visible striations (lines in skeletal muscle) show the direction of muscle contraction.
Muscle Fatigue	The inability of a muscle to maintain force or contraction due to lack of ATP, accumulation of lactic acid, or depletion of energy stores.
Electromyogram (EMG)	A recording of electrical activity produced by skeletal muscles; used to diagnose muscle or nerve disorders.
Tetany	A sustained, maximal muscle contraction resulting from rapid, repeated stimulation without relaxation between stimuli.

Created by: user-1898008

"Know" box contains:
Time elapsed:
Retries: