Lecture 4 - Muscle Tissue (Ppt)

Question 1

The ability to receive and respond to a stimulus

Answer 1

Excitability

Question 2

The response is the generation of an electrical impulse that travels along the plasma membrane of the muscle cell

Answer 2

Excitability

Question 3

The ability to shorten forcibly when adequately stimulated.
This is the defining property of muscle tissue.

Answer 3

Contractility

Question 4

The ability to be stretched

Answer 4

Extensibility

Question 5

Loosely wrapped around the actin helix and covering the myosin binding site is the filamentous protein called?

Answer 5

Tropomyosin

Question 6

This strand is a polymer that resembles a string of beads

Answer 6

Actin

Question 7

Bound to both the actin and the tropomyosin is a trio of proteins collectively known as?

Answer 7

Troponin

Question 8

The portion of the sarcomere which does not contain any thick filament, contains only thin filament and is light under the microscope

Answer 8

I band

Question 9

Hold the thick filaments to one another

Answer 9

M line

Question 10

The sarcomere is flanked by 2 protein structures known as?

Answer 10

Z discs

Question 11

The portion of the sarcomere which contains the think filament

Answer 11

A band

Question 12

The A band contains..

Answer 12

A zone of overlap between thick and thin filaments

Question 13

Contains only thick filaments

Answer 13

H zone

Question 14

4 steps of muscle contraction

Answer 14

• excitation
• excitation-contraction coupling
• contraction
• relaxation

Question 15

The nerve that carries signals from the spinal cord to the muscle

Answer 15

Axons

Question 16

Within the muscle, each axon will go its own way and eventually branch into multiple small extensions called?

Answer 16

Telodendria

Question 17

Each telodendrium ends in a bulbous swelling known as?

Answer 17

Synaptic end bulb

Question 18

The site of interaction between a neuron and any other cell

Answer 18

Synapse

Question 19

The synapse between neuron and a muscle

Answer 19

Neuromuscular junction

Question 20

The minute space between the synaptic end bulb and the sarcolemma

Answer 20

Synaptic cleft

Question 21

A depression in the sarcolemma at the synaptic cleft

Answer 21

Motor end plate

Question 22

The synaptic end bulb is filled with vesicles that contain the neurotransmitter?

Answer 22

Acetylcholine

Question 23

Stabilizes the sarcolemma and protects muscle fires from long-term contraction-induced damage and necrosis

Answer 23

Dystrophin

Question 24

Examples of organ containing smooth muscles

Answer 24

Walls of internal organs such as:
Stomach
Intestines
Urinary bladder
Uterus
Arteries
Veins
Base of hair follicles
Iris of the eye

Question 25

Functions of smooth muscle (ppt)

Answer 25

a. Movement of food through the digestive tract B. Constriction of blood vessels c. Emptying of the bladder

Question 26

Characteristics of smooth muscles

Answer 26

Elongated cells Cells with tapering ends Single central nuclei Arranged as bundles, sheets, or cords Involuntary

Question 27

Functional structures of smooth muscle fibers

Answer 27

Bundles Sheets Cords

Question 28

Characteristics of cardiac muscles

Answer 28

-Short fibers -Branching, weaving networks -Overlapping sarcolemma which forms intercalated discs

Question 29

Characteristics of skeletal muscle

Answer 29

Strongly visible striations Elongated cells Multinucleated cells Parallel fibers