Muscle Tissue

Question 1

What are the (3) types of muscle tissue?

Answer 1

Skeletal, cardiac, smooth

Question 2

What is muscle tissue?

Answer 2

Consists of specialized contractile tissue supported by connective tissues sheaths, and are considered “excitable tissue”

also called muscle fibres due to their shape

Question 3

What are skeletal muscles?

Answer 3

Cells are long and thin and have visible bands or striations.

Skeletal muscle cells are called muscle fibres due to their shape and are multinucleated due to their length

• fibres are packaged by connective tissue to form individual muscles. this connective tissue covering forms the tendon, which attaches the muscle to bone
  -skeletal muscles are under voluntary control

Gets Calcium from SER

No gap junctions

striated and voluntary

Question 4

What does it mean if a cell is multinucleated?

Answer 4

Has more than one nucleus

Question 5

What are cardiac muscles?

Answer 5

These tissues make up most of the heart

cells are striated but are smaller, shorter, uninucleated, and have branching fibres

-cardiac muscle fibres fit tightly together with intercalated discs or gap junctions, allowing the heart to contract in a synchronized fashion
-cells contain up to 35% mitochondria
-under involuntary control

striated and involuntary

Question 6

What are smooth muscles?

Answer 6

Cells are small, uninucleated, and have no visible striations. They are found in the walls of hollow organs such as the stomach, bladder, uterus, and vessels

-smooth muscle contraction can cause organ diameter to be reduced (constriction) and relaxation causes the diameter to increase (dilation)
-contracts much slower than the other muscle types
-vital in the regulation of blood flow, blood pressure, and in moving food through the digestive tract (peristalsis)