Class 5 - App - Muscular System Definitions

Question 1

What is Smooth Muscle?

Answer 1

Involuntary muscle found in walls of organs, blood vessels, and respiratory passages.

Question 2

What is Cardiac Muscle?

Answer 2

Involuntary muscle located in the heart.

Question 3

What is Skeletal Muscle?

Answer 3

Voluntary muscle attached to bones, responsible for body movement.

Question 4

What does Excitable mean in muscle context?

Answer 4

Ability of muscle to respond to stimulation from the nervous system.

Question 5

What does Contractile mean?

Answer 5

Ability of muscle to shorten forcefully.

Question 6

What does Extensible mean?

Answer 6

Ability of muscle to be stretched or lengthened.

Question 7

What does Elastic mean?

Answer 7

Ability of muscle to return to its original size and shape after stretching.

Question 8

What is Endomysium?

Answer 8

Connective tissue surrounding each individual muscle fiber.

Question 9

What is Perimysium?

Answer 9

Connective tissue surrounding a bundle of muscle fibers (fascicle).

Question 10

What is Epimysium?

Answer 10

Connective tissue surrounding the entire muscle.

Question 11

What is Fascia?

Answer 11

Tough, pliable sheet of connective tissue that covers, divides, and supports body structures.

Question 12

What is a Tendon?

Answer 12

A cord-like structure that connects muscle to bone.

Question 13

What is Aponeurosis?

Answer 13

A broad, flat sheet of connective tissue connecting muscles to bones or other tissues.

Question 14

What is a Myofibril?

Answer 14

Cylindrical organelles inside muscle fibers made of myofilaments.

Question 15

What is a Myofilament?

Answer 15

Protein filaments (actin and myosin) in muscle fibers responsible for contraction.

Question 16

What is Actin?

Answer 16

Thin, light-colored myofilament involved in muscle contraction.

Question 17

What is Myosin?

Answer 17

Thick, dark-colored myofilament that interacts with actin to cause contraction.

Question 18

What is a Sarcomere?

Answer 18

The basic contractile unit of muscle fibers.

Question 19

What is Sarcolemma?

Answer 19

The plasma membrane of a muscle fiber.

Question 20

What is Sarcoplasm?

Answer 20

The cytoplasm within a muscle fiber.

Question 21

What is Sarcoplasmic Reticulum?

Answer 21

The endoplasmic reticulum in muscle cells that stores and releases calcium.

Question 22

What is the Sliding Filament Mechanism?

Answer 22

The process of muscle contraction where myosin pulls actin filaments together, shortening the muscle.

Question 23

What is a Motor Neuron?

Answer 23

Nerve cells that transmit signals from the brain and spinal cord to muscles, triggering contraction.

Question 24

What is a Motor Unit?

Answer 24

A motor neuron and all the muscle fibers it stimulates.

Question 25

What is a Neuromuscular Junction?

Answer 25

The synapse between a motor neuron and a muscle fiber.

Question 26

What is Acetylcholine?

Answer 26

A neurotransmitter released by motor neurons to stimulate muscle contraction.

Question 27

What is a Threshold Stimulus?

Answer 27

The minimum level of stimulation required to cause a muscle contraction.

Question 28

What is ATP (Adenosine Triphosphate)?

Answer 28

The energy molecule used to power muscle contractions and relaxations.

Question 29

What is a Musculotendinous Junction?

Answer 29

The transitional zone from muscle fascia to tendon or aponeurosis.

Question 30

What is a Tenoperiosteal Junction?

Answer 30

The transitional zone from tendon/aponeurosis to bone periosteum.