Muscle tissue

Question 1

Skeletal muscle tissue

Answer 1

Most are attached to the bones of the skeleton by tendons, called muscle fibers, perform voluntary movements, multinucleate, and they are striated

Question 2

Contractile tissues

Answer 2

Muscle tissues are contractile tissues, they generate tension and movement

Question 3

Multinucleate

Answer 3

Each cell has more than one nucleus

Question 4

Striations

Answer 4

Alternating light and dark bands that can be seen when muscle tissue is examined with a microscope

Question 5

What are some functions of skeletal muscle tissue?

Answer 5

Producing voluntary body movements, maintaining posture, breathing movements, and generating heat

Question 6

Cardiac muscle tissues

Answer 6

Found in the walls of the heart, responsible for the heartbeat, uninucleate, striated, action is involuntary has intercalated discs

Question 7

Uninucleate

Answer 7

one nucleus per muscle fiber

Question 8

Involuntary actions

Answer 8

Contraction and relaxation is not consciously controlled

Question 9

Autohythmicity

Answer 9

The build-in rhythm of the heart is created by the pacemaker

Question 10

Intercercalated discs

Answer 10

Interlocking attachment sites between cardiac muscle fibers

Question 11

Desmosomes

Answer 11

Cell junctions that firmly hold cardiac muscle cells together

Question 12

Gap junction

Answer 12

Protein channels for electrochemical signals to pass from cell to cell stimulate the heartbeat

Question 13

Smooth muscle tissue

Answer 13

Located on the walls of hollow internal structures, non-striated, spindle-shaped muscle fibers with one nucleus, involuntary control, move substances within the body, contraction of this muscle tissue can cause constriction and dilation

Question 14

Peristalsis

Answer 14

The smooth muscle moves food through the gastrointestinal tract and produces a wave-like motion

Question 15

Contraction of smooth muscles

Answer 15

Causes constriction of blood vessels, which reduces blood flow and increases blood pressure

Question 16

Relaxation of smooth muscles

Answer 16

Walls dilate blood vessels, which increases blood flow and lowers blood pressure

Question 17

Excitability

Answer 17

Ability to respond to nervous stimulation or electrical stimulation

Question 18

Contractibility

Answer 18

Ability to contract forcefully when stimulated. If enough tension is generated, the muscle tissue shortens and movement occurs

Question 19

Extensibility

Answer 19

Ability to stretch without tearing

Question 20

Elasticity

Answer 20

Ability to return to the muscle tissues’ original length after stretching or after contracting

Question 21

Tendon

Answer 21

A cord of dense regular connective tissue that attaches a muscle to the periosteum of the bone

Question 22

Aponeurosis

Answer 22

A broad, flattened tendon

Question 23

Areolar connective tissue

Answer 23

Surround and protect individual muscle fibers

Question 24

Fascicle

Answer 24

A bundle of 10-100 muscle fibers within a muscle, gives muscle its “grain”

Question 25

Deep fascia

Answer 25

Refers to the sheet of dense irregular connective tissue that surrounds groups of muscles and separates the muscles into functional compartments

Question 26

Embryonic development

Answer 26

100 or more embryonic stem cells called myoblasts fuse to form a muscle fiber, making the muscle fiber multinucleate

Question 27

Satellite cells

Answer 27

Adult stem cells that develop from myoblasts and remain in mature muscle tissue

Question 28

Mitochondria

Answer 28

Organelles that use nutrients and O2 to produce ATP energy for the cell several mitochondria lie close to the myofibrils and provide ATP energy for muscle contraction

Question 29

Unfused tetanus

Answer 29

Muscle fibers are stimulated 20-30 times per second partially relaxed between contractions, the result is a sustained by wavering contraction

Question 30

Fused tetanus

Answer 30

Muscle fibers are stimulated 80-100 times per second and do not relax at all