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34 notecards = 9 pages (4 cards per page)

Viewing:

microscopic anatomy and organization of skeletal muscle

front 1

Which is not true of skeletal muscle?

a. It enables you to manipulate your enviroment.
b. It influences the body's contours and shape.
c. It is one of the major components of hollow
organs.
d. It provides a means f locomotion.

back 1

c. It is one of the major components of hollow organs.

front 2

Because the cells of skeletal muscle are relatively large and clindrical in shape, they are also known as__________.

back 2

Fibers

front 3

Skeletal muscle cells have more than one nucleus.

true/false

back 3

True

front 4

The two contractile proteins that make up the myofilaments of skeletal muscle are _______and ______.

back 4

myosin and actin

front 5

Each muscle cell is surrounded by thin connective tissue called the

back 5

endomysium

front 6

A strong cordlike structure that connects a muscle to another muscle or bone is

back 6

a tendon

front 7

The junction between a nerve fiber and a muscle cell is called a _______.

back 7

neuromuscular junction

front 8

The neuron and muscle fiber membranes do not actally touch but are seperated by a fluid-filled gap.
True/False

back 8

True

front 9

Humans have how many muscles and make up 40% of the body weight.

back 9

650

front 10

What are the functions of muscle tissue?

back 10

movement
posture and body position
stabilize joints
heat generation and protection

front 11

What are the special characeritics of muscles?

back 11

excitability
contractility
extensibility
elasticity (recoil)

front 12

Smooth muscle tissue

back 12

is found in the walls of hllow visceral organs such as the stomach, urniary bladder, and respiratory passages.

front 13

Motor unit

back 13

is a motor neuron and all the muscles it supplies

front 14

What is muscle twitch?

back 14

is a rapid contraction that is triggered by a single action potential.
Sometimes, we experience muscle twitches around our eyes.

front 15

Muscle tone

back 15

skeletal muscle s always slightly contracted due to spinal reflexed. It does not produce ative movement. Essential to keep muscles firm, healthy, ready to respond, stablize posture and joints.

front 16

In muscle metabolism, muscle fibers can make ATP via three mechanisms:

back 16

1. aerobic respiration- requieres O2--slow, but makes the most ATP per molecule of glucose.

2.creatine kinase- does not requiere O2--transfers a phosphate from cretine phosphate to ADP to make ATP.

3. lactic acid fermentation- does not require O2--couples a fermentation step with glycolyis; glucose to latic ad-anerobic-faster than aerobic pathwy but only 5% efficient.

front 17

A prime mover or ___________ is responsible for producing a particular type of movement.

back 17

agonist

front 18

Skeletal muscles are named on the basis of many criteria. Name one?

back 18

direction of muscle fibers

front 19

True/False
Muscles of acial expression differ from most skeletal muscles because they insert into the skin or other muscles rather than into bone.

back 19

True

front 20

The _________ musculature includes muscles that move the vertebral colum and muscles that move the ribs.

back 20

Trunk

front 21

Muscles that act on the _____ cause movement at the hip, knee, and foot joints.

back 21

lower limb

front 22

This two-headed muscle bulges when the forearm is flexed. It is the most familiar muscle of the anterior humerus. It is the ____.

back 22

biceps brachili

front 23

These abdominal muscles are responsible for giving me my "six pack". They also stabalize my pelvis when walking. They are the ________.

back 23

rectus abdominis

front 24

This lower limb muscle, which attaches the the knee is extended, is the _________.

back 24

Gastrocnemius

front 25

The ________is the largest and most superficial of the gluteal muscles.

back 25

gluteus maximus

front 26

True/False
Another name for a muscle cell is muscle fiber?

back 26

True

front 27

Skeletal muscle is:

back 27

epimysium

front 28

The functional unit of skeletal muscle is the

back 28

sarcomere

front 29

The thin filament of muscle cells is called

back 29

actin

front 30

the thick filaments of muscle are

back 30

myosin

front 31

True/False

When the thick and thin filaments link together they form what are called crossbridges.

back 31

True

front 32

Myglobin has a special funtion in muscle tissues. It______________.

back 32

holds a reserve supply of oxygen in the muscle

front 33

In skeletal muscle which region or organelle contains the highest concentration of calcium ions in a resting muscle fiber?

back 33

sarcoplasmic reticulum (SR)

front 34

The theory of muscle contaction is called

back 34

sliding filament model