Basic And Applied Sciences

Question 1

Muscle Fibers

Answer 1

fibers in your muscle that have the diameter of a human hair.

Question 2

Sarcolemma

Answer 2

thin elastic membranes with a phospholipid bilayer and outer membrane with collage and other structural elements that surrounds each fiber.

Question 3

sarcoplasm

Answer 3

the cytoplasm of the muscle fiber

Question 4

sarcoplasmic reticulum

Answer 4

the network of tubular channels and vesicles, providing structural integrity.

Question 5

myofibril

Answer 5

contains long and thin chain proteins (actin, myosin, and titan). multiple myofibrils make up a muscle fiber

Question 6

myofilament

Answer 6

these contain protein chains containing actin and myosin and are the smaller components of myofibrils in muscle fibers

Question 7

sarcomere

Answer 7

the smallest functional unit of a muscle fiber, containing actin and myosin proteins to help muscles contract.

located between the two z-lines and consists of the A-band, Hzone I band and Z line

Question 8

transverse tubular system

Answer 8

a system of tubes that wraps around the fibrils, storing calcium ions

Question 9

myosin

Answer 9

similar to a string of beads that are responsible for splitting ATP

Question 10

actin

Answer 10

protein that forms in the inner myofilament, consisting of two strands of actin in a double helix. sarcomere contracts when actin and myosin binds together and completes a power stroke

Question 11

troponin

Answer 11

a protein located at regular intervals along the actin filament and binds with the calcium ion

Question 12

tropomyosin

Answer 12

protein in the I-band, inhibits actin and myosin binding, preventing a constant state of muscle contraction

Question 13

acetylcholine

Answer 13

a neurotransmitter that diffuses across the junction and initiates muscle contraction

Question 14

all or none principle

Answer 14

mucle neurons with either elicit activation of all muscle fibers or none at all