Muscle Tissue

Question 1

What are the 3 types of muscle tissue?

Answer 1

1. Skeletal
2. Cardiac
3. Smooth

Question 2

This type of muscle has spindle shaped cells with one centrally located nucleus.

Answer 2

Smooth (visceral) muscle

Question 3

1. Smooth (visceral) muscles is in the walls of most ________, it moves substances through them
2. Does it have striations?

Answer 3

1. Organs
2. No!

Question 4

This type of muscle is located in the heart, it moves blood through it. Cells can have one or two centrally located nuclei

Answer 4

Cardiac

Question 5

Cardiac muscle has short cylindrical cells. Some cells are ______, a unique feature.

Answer 5

Bifurcated

Question 6

These are the visible gap junctions between cells in cardiac muscle

Answer 6

Intercalated discs

Question 7

This type of muscle moves the skeleton, stabilizes joints, and produces heat when in contracts.

Answer 7

Skeletal Muscle

Question 8

1. Skeletal has long, cylindrical cells that are uni or multi nucleated?
2. Where are the nuclei located?

Answer 8

1. Multinucleated
2. Periphery of the cell

Question 9

Skeletal muscle is made up of many ________s, which each are one muscle cell

Answer 9

Muscle Fibers

Question 10

Every skeletal muscle is classified as an ________, it has CT, blood vessels, nerves

Answer 10

Organ

Question 11

These attach skeletal muscle to bone

Answer 11

Tendons

Question 12

What are tendons composed of?

Answer 12

Dense Regular Connective Tissue

Question 13

These are flat, sheet-like tendons

Answer 13

Aponeuroses

Question 14

1. Each muscle fiber is wrapped in….
2. A group of muscle fibers is called…
3. The fascicle is surrounded by…
4. An entire muscle is surrounded by….

Answer 14

1. Endomysium
2. Fascicle
3. Perimysium
4. Epimysium

Question 15

Surrounding all of the connect tissue wrappings in muscle is….

Answer 15

Deep Fascia

Question 16

This binds skin to muscles

Answer 16

Superficial fascia

Question 17

1. What is the muscle cell membrane called?
2. What about the cytoplasm?

Answer 17

1. Sarcolemma
2. Sarcoplasm

Question 18

The muscle cell has organelles like lysosomes, ribosomes, and an endoplasmic reticulum which is called the….

Answer 18

Sarcoplasmic Reticulum

Question 19

What’s the role of the sarcoplasmic reticulum?

Answer 19

Stores Ca²⁺ ions needed for muscle contraction

Question 20

These are invaginations of the sarcolemma, and serve to rapidly conduct the nerve impulse through the muscle fiber

Answer 20

Transverse Tubules (T-Tubules)

Question 21

Each muscle fiber is composed of…

Answer 21

Myofibrils

Question 22

The myofibril is composed of protein filaments called…

Answer 22

Myofilaments

Question 23

This is the component of the thick myofilaments of the myofibril

Answer 23

Myosin

Question 24

This is the component of the thin filament of the myofibril

Answer 24

Actin

Question 25

The arrangement of myofilaments leads to what visible arrangment?

Answer 25

Striations

Question 26

1. These are the lightly colored bands of myofibrils 2. What are they composed of?

Answer 26

1. I bands 2. Think myofilaments only

Question 27

1. These are the dark bands of the myofilament 2. What are they composed of?

Answer 27

1. A bands 2. Thick AND thin filaments

Question 28

1. This is the dark structure in the middle of an I band 2. Importantly, what attaches to it?

Answer 28

1. Z disc (Z line) 2. Thin myofilament

Question 29

1. This is a lighter, central region in the middle of an A band 2. What is it composed of?

Answer 29

1. H Zone (H Band) 2. Thick myofilaments **only**

Question 30

1. This is the dark line in the middle of the H zone 2. What attaches to it?

Answer 30

1. M disc 2. Thick myofilaments

Question 31

1. These are the functional contractil unit of myofibrils.. 2. They run from ____ to \_\_\_\_, creating the banded pattern

Answer 31

1. Sarcomere 2. Z-disc to Z-disc

Question 32

In the sliding filament model of contraction, the muscle is stimulated by a nerve, what does this cause?

Answer 32

Sarcomere shortening

Question 33

The thick and thin filaments slide over one another, shortening the length of the sarcomere, causing the muscle to contract

Answer 33

: D

Question 34

1. During muscle contraction, what happens to the H zone? 2. I zone? 3. Z discs? 4. A band?

Answer 34

1. It disappears 2. It narrows 3. Move closer together 4. Width stays the same