Terms

Question 0

Properties of a muscle

Answer 0

Contractibility, excitability, extensibility, elasticity

Question 1

Functions of the muscular system

Answer 1

Movement, posture,respiration, body heat production, communication, constrictions of organs of the heart, contraction of the heart

Question 2

Skeletal muscle

Answer 2

Attached to bone, long and cylindrical, multiple nuclei, has striations, voluntary and involuntary (reflexes), function is body movement, not capable of spontaneous contraction

Question 3

Smooth muscle

Answer 3

Located on walls of hollow organs,blood vessels, eyes, glands, and skin, spindle shaped, one nucleus, no striations, involuntary control, some smooth muscle is capable of spontaneous contraction. Several functions.

Question 4

Cardiac muscle

Answer 4

In the heart, cylindrical and branched, single nucleus, has striations, in involuntary control, capable of spontaneous contraction, function is to pump blood

Question 5

Skeletal muscle fibers

Answer 5

Cells inside each skeletal muscle

Question 6

Fasciculi

Answer 6

Visible bundles inside the muscle.

Question 7

Perimyseum

Answer 7

Connective tissue layer that surrounds each fasciculi

Question 8

Epimysium

Answer 8

Connective tissue that surrounds the entire muscle

Question 9

Fascia

Answer 9

Connective tissue sheets within the body

Question 10

Muscular fascia

Answer 10

Contains dense irregular collagenous connective tissue. It separates individual muscles or groups of muscles. Located superficial to the epimysium

Question 11

Motor neurons

Answer 11

Stimulate muscle to contract

Question 12

Myoblasts

Answer 12

Multinucleated cells that muscle fibers develop from

Question 13

Sarcolemma

Answer 13

Plasma membrane of a muscle fiber

Question 14

External lamina

Answer 14

Deeper and thinner connective tissue of the two that are located just outside the sarcolemma.

Question 15

Endomyasium

Answer 15

Second layer of tissue right outside the sarcolemma. Much thicker than the external Latina

Question 16

Transverse (T) tubules

Answer 16

Along the surface of the sarcolemma which extend inward, connecting the extracellular environment with the interior of the muscle fiber

Question 17

Sarcplasmic reticulum

Answer 17

Endoplasmic reticulum. Associated with the t tubules

Question 18

Sarcoplasm

Answer 18

Stored the mitochondria and glycogen granules. Contains myofibrils- bundles of protein filaments

Question 19

Myofiliments

Answer 19

Protein filaments

Question 20

Actin myofilament

Answer 20

Thin myofilaments. Contains a series of tropomyosin and troponin molecules as well as fibrous actin

Question 21

Myosin myofilaments

Answer 21

Thick myofilaments

Question 22

Sarcomere

Answer 22

Ordered units of myofilaments. Joined end to end to form myofibrils

Question 23

Fibrous actin

Answer 23

Each actin myofilament contains two of these strands

Question 24

Globular actin monomers

Answer 24

Each f actin has about 200 of these strands

Question 25

Myosin molecules

Answer 25

In myosin myofilaments. Includes two myosin heavy chains wound together to form a rod portion which lays parallel to the myosin myofilaments and two myosin heads (extend laterally)

Question 26

Cross bridges

Answer 26

Myosin heads can for to create these

Question 27

Z disk

Answer 27

Dislike stricter for the actin myofilaments to attach to

Question 28

Titin

Answer 28

Allows the sarcomere to stretch and recoil. Single chain. Largest known protein

Question 29

Action potential

Answer 29

Electrical signals carried along axons

Question 30

Ligand-gated ion channels

Answer 30

Binds to a receptor that is part of the ion channel

Question 31

Neurotransmitters

Answer 31

Bind to ligand-gated sodium channels in the membranes of the muscle fibers. Because of that sodium channels open, allowing sodium to enter the cell

Question 32

Polarized

Answer 32

Inside of most plasma membrane is negatively charged compared with the outside

Question 33

Resting membrane potential

Answer 33

Charge difference across the plasma membrane of an unstimulated cell