Muscle Tissue

Question 1

what are the characteristics of muscle tissue and explain?

Answer 1

excitability: muscle cells can respond to stimulus, contractility: muscle cells can forcefully shorten, extensibility: muscle cells can be stretched (lengthen) and elasticity: muscle cells can recoil after shortening or lengthening.

Question 2

list the types of muscle and where they are found

Answer 2

skeletal muscle found attached to bones, cardiac muscle found ONLY in the heart and smooth muscle found in organs of the digestive, respiratory, urinary, reproductive tracts, the walls of blood vessels and in the arrector pili muscle of skin

Question 3

what is a fascicle?

Answer 3

single skeletal muscle that is composed of large bundles of muscle fibers

Question 4

What are Myofibrils?

Answer 4

Each myofibril is a bundle of thick and thin myofilaments

Question 5

What are sacromere?

Answer 5

It’s the functional contractile unit of a muscle fiber.

Question 6

What are the other names for think and thin myofilaments?

Answer 6

Actin- thin myofilaments and myosin- thick myofilaments

Question 7

What are sarcomeres made up of?

Answer 7

Myofilaments that are organized into repeating functional units

Question 8

Whats the A band?

Answer 8

Its the dark band of sarcomeres that has overlapping thick and thin myofilaments

Question 9

What is an I band?

Answer 9

It is the side of the A band that only contains thin myofilaments.

Question 10

Whats H zone/band?

Answer 10

It is the middle of the A band that only contains thick myofilaments

Question 11

What of the M line?

Answer 11

Its located in the middle of each H band/zone

Question 12

Z line? and what protein do they contain?

Answer 12

They mark the boundary between adjacent sarcomeres and the protein is called actinins

Question 13

What are the connective Tissues Associated with Muscle Tissue and they’re found

Answer 13

Epimysium- surrounds the entire muscle
Perimysium- a fibrous layer that divides the skeletal muscle into compartments, each muscle fascicle is wrapped by the perimysium layer
Endomysium- elastic connective tissue that surrounds the individual skeletal muscle cells (muscle fibers)

Question 14

Myosatelite cells?

Answer 14

They are stems cells that help repair damaged muscle tissue

Question 15

Skeletal muscle tissue is highly WHAT and highly WHAT?

Answer 15

vascularized and innervated.

Question 16

Myoblasts and what they do?

Answer 16

It occurs during embryonic development, groups of embryonic cells and they fuse together to form a multinucleated cell called a muscle fiber

Question 17

what happens to the myoblasts that does not fuse?

Answer 17

they remain in the endomysium and they form myosatellite cells

Question 18

Sarcoplasm?

Answer 18

its the cytoplasm of the muscle fiber

Question 19

What is myoglobin?

Answer 19

It is the protein responsible for storing oxygen

Question 20

What’s a sarcolemma

Answer 20

The plasma membrane of a muscle fiber

Question 21

What are T tubules and what’s their other name?

Answer 21

They form passageways through the muscle fiber and they are called transverse tubules

Question 22

What’s a sarcoplasmic reticulum

Answer 22

They are a type of smooth endoplasmic reticulum that forms a tubular network around each myofibril