Muscle contraction

Question 1

At any given time muscles are stimulated while other aren’t this causes tightened firmed muscle

Answer 1

Muscle tone

Question 2

Types of muscle contractions

Answer 2

Isotonic and isometric contractions

Question 3

What is an istotonic contraction

Answer 3

Same tone or tension and myofilaments are successful in their sliding movements the muscle shortens and movement occurs

Question 4

What is an isometric contraction

Answer 4

Same measurement and tension of muscle keeps increasing but no movement happens

Question 5

When a muscle loses its ability to contract during strenuous exercise it is referred to as what?

Answer 5

Fatigue

Question 6

What prevents a muscle from contracting

Answer 6

Lowered pH as a result of accumulated lactic acid

Question 7

How does a muscle cramp occur

Answer 7

Lack of ATP required to return calcium ions back to sarcoplasmic reticulum so muscle fibers can relax

Question 8

When may oxygen deficiency occur

Answer 8

Strenuous exercise and lactic acid accumulates as an end product of anaerobic respiration

Question 9

What stores oxygen in muscle tissue

Answer 9

Pigment myoglobin

Question 10

What carries oxygen to the muscle

Answer 10

Hemoglobin in red blood cells

Question 11

When is the complete breakdown of glucose enabled in the mitochondria

Answer 11

Early phase of cellular respiration

Question 12

Energy for contraction comes from the molecules of what

Answer 12

Atp

Question 13

What stores energy release by the mitochondria

Answer 13

Creatine phosphate

Question 14

As atp decomposes what happens

Answer 14

Energy from creatine phosphate can be transferred to ADP molecules converting them back to ATp

Question 15

What is a motor unit

Answer 15

A motor neuron and muscle fibers it controls

Question 16

What does a motor unit do

Answer 16

When told to do so muscle fibers of motor unit contract all at once

Question 17

Where do the motor neuron and muscle fiber meet

Answer 17

Neuromuscular junction

Question 18

What does the cytoplasm of the motor neuron contain

Answer 18

Numerous mitochondria and synaptic vesicles storing neaurotransmitters

Question 19

What do cross bridges do

Answer 19

Link thick and thin filaments together during contraction

Question 20

What is the h zone

Answer 20

Center of a bands and consists of myosin filaments

Question 21

What are the thick filaments

Answer 21

Myofilaments

Question 22

What are actin filaments made up of

Answer 22

Protein actin

Question 23

What is the sarcolemma

Answer 23

Cell membrane

Question 24

What is sarcoplasm

Answer 24

Cytoplasm

Question 25

What are the muscle functions

Answer 25

Produce movement,maintain posture,stabilize joints,and generate heat

Question 26

Which two muscles are involuntary

Answer 26

Cardiac and smooth

Question 27

Which muscle is a striated muscle with intercalated discs

Answer 27

Cardiac

Question 28

Has no striations

Answer 28

Smooth

Question 29

Cells are spindle shaped and have single nucleus

Answer 29

Smooth

Question 30

Arranged in sheets or layers

Answer 30

Smooth

Question 31

Found mainly in walls of visceral organs

Answer 31

Smooth

Question 32

What are the functions of tendons

Answer 32

Anchor muscles and provide durability and conserve space

Question 33

Sheath of connective tissue that encloses a muscle fiber

Answer 33

Endomysium

Question 34

A coarse of fibrous membrane that encloses several sheathed muscle fibers

Answer 34

Perimysium

Question 35

Bundle of fibers held together by the perimysium

Answer 35

Fascicle

Question 36

Tough connective tissue which binds together many fascicles

Answer 36

Epimysium

Question 37

Cords of dense fibrous tissue attaching a muscle to a bone

Answer 37

Tendons

Question 38

Blend together to form the cordlike tendons or into sheet like aponeuroses which attach muscle indirectly to bone and cartilage

Answer 38

Epimysia

Question 39

Skeletal muscle fibers are packed into organs called what

Answer 39

Skeletal muscles

Question 40

Skeletal muscle is also known as what

Answer 40

Striated muscle