Muscular System

Question 1

composed mainly of muscle tissue, the most abundant tissue of the body & one the most adaptable.

Answer 1

Muscular System

Question 2

More than 50% of bodyweight

Answer 2

Muscular system

Question 3

Made up of proteins and water

Answer 3

Muscular system

Question 4

Muscles in the root of the hair gives ___

Answer 4

Goosebumps

Question 5

It takes __ muscles to smile

Answer 5

17

Question 6

It takes ___ muscle to frown

Answer 6

42

Question 7

It is the largest muscle in our body

Answer 7

Gluteus maximus

Question 8

The major functions of muscular system are:

Answer 8

1. To provide movement of the body- Primary job of the muscle (So the muscle moves through the nervous system)
2. Maintenance of posture
3. Respiration
4. Production of body heat - Every time muscle contracts, you generate heat
5. Communication
6. Constriction of organs and vessels
7. Contraction of the heart- enables the heart to beat (cardiac muscle)

Question 9

4 Major Functional Characteristics of Muscle Tissue:

Answer 9

1. Contractility
2. Excitability
3. Extensibility
4. Elasticity

Question 10

ability to shorten forcefully

Answer 10

Contractility

Question 11

capacity to respond to a stimulus.

Answer 11

Excitability

Question 12

can be stretched beyond its normal resting length and still be able to contract.

Answer 12

Extensibility

Question 13

ability to recoil to its original resting length after it has been stretched.

Answer 13

Elasticity

Question 14

Shapes of Muscles

Answer 14

• Triangular - shoulder, neck
• Spindle - arms, legs
• Flat - diaphragm, forehead
• Circular - mouth, anus

Question 15

• Most are attached by tendons to bones

Answer 15

SKELETAL MUSCLE

Question 16

• Cells have more than one nucleus (multinucleated)

Answer 16

Skeletal Muscle

Question 17

• Striated - have stripes, banding

Answer 17

Skeletal muscle

Question 18

• Voluntary - subject to conscious control

Answer 18

Skeletal muscles

Question 19

Skeletal muscle

• Tendons are mostly made of ___ fibers

Answer 19

Collagen

Question 20

• Found in the limbs

Answer 20

Skeletal muscles

Question 21

• Produce movement, maintain posture, generate heat, stabilize joints
The contractile elements of skeletal muscle cells are myofibrils

Answer 21

Skeletal muscles

Question 22

• No striations
• Spindle shaped
• Single nucleus
• Involuntary - no conscious control

Answer 22

SMOOTH MUSCLE

Question 23

• Found mainly in the walls of hollow organs

Answer 23

Smooth muscle

Question 24

• Lines walls of viscera

Answer 24

Smooth muscle

Question 25

• Found in longitudinal or circular arrangement

Answer 25

Smooth muscle

Question 26

• Alternate contraction of circular & longitudinal muscle in the intestine leads to peristalsis

Answer 26

Smooth muscle

Question 27

• Actin and myosin filaments are present (protein fibers)

Answer 27

Smooth muscle

Question 28

• Striations
• Branching cells
• Involuntary
• Found only in the heart

Answer 28

Cardiac muscle

Question 29

• Usually has a single nucleus, but can have more than one
• Main muscle off heart
• Pumping mass of heart
• Critical in humans

Answer 29

Cardiac muscle

Question 30

True or false

Heart muscle cells behave as one unit

Answer 30

True

Question 31

True or false

• Heart always contracts to its full extent

Answer 31

True

Question 32

• ___ cells are short, branched and interconnected

• Cells are striated & usually have 1 nucleus

Answer 32

Cardiac muscle

Question 33

Cardiac muscle

• Adjacent cardiac cells are joined via electrical synapses (gap junctions)

• These gap junctions appear as dark lines and are called __

Answer 33

intercalated discs

Question 34

Regulated by autonomic nervous system

Answer 34

Cardiac muscle