Lecture Week 9 Flashcards

1
Q

What are the types of muscle?

A

Skeletal, Smooth, Cardiac

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2
Q

Skeletal Muscle Info

A

Attached to skeleton, cylinder shape, many nuclei/cell, striations present, voluntary control

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3
Q

Smooth Muscle Info

A

Walls of hollow internal organs, spindle cell shape (wide in middle, taper at the ends), one nuclei/cell, striations absent, involuntary control

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4
Q

Cardiac Muscle Info

A

Location - heart, branched cylinder shape, one nuclei/cell, striations present, involuntary control

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5
Q

Multinucleate

A

More than one nucleus per fiber

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6
Q

Uninucleate

A

Fiber has single nucleus

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7
Q

What does skeletal muscle refer to?

A

Tissue and organs

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8
Q

What are functions of skeletal muscle tissue?

A

Produce skeletal movement, maintain posture and position, support soft tissues, guard body entrances and exits, maintain body temp, provide nutrient reserves

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9
Q

Origin

A

Point of attachment that does not move when the muscle contracts

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10
Q

Insertion

A

Point of attachment that moves when the muscle contracts

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11
Q

Action

A

Type of movement that occurs when a muscle contracts

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12
Q

Agonist (aka prime mover)

A

Primary muscle responsible for an action

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13
Q

Antagonist

A

Muscle responsible for the action that opposes the prime mover

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14
Q

Synergist

A

Muscle assisting a prime mover

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15
Q

What does each skeletal muscle consist of?

A

Organ consists of muscle, nervous, and connective tissues

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16
Q

Tendon/Aponeurosis

A

Anchors muscle to bone, dense connective tissue

17
Q

Fascia

A

Separates muscle from surrounding organs, dense connective tissue

18
Q

Epimysium

A

Surrounds skeletal muscle, dense connective tissue

19
Q

Perimysium

A

Surrounds fascicle, dense connective tissue

20
Q

Endomysium

A

Surrounds fiber, areolar tissue

21
Q

Sarcolemma

A

Plasma membrane

22
Q

Sarcoplasm

A

Cytoplasm

23
Q

Mitochondria

A

Sites for cellular respiration

24
Q

Myofibrils

A

Structures that contract

25
Q

Myofilaments (filaments)

A

Thick - myosin
Thin - actin

26
Q

Sarcoplasmic Reticulum

A

ER, sotres calcium

27
Q

Transverse (t-) tubules

A

Run between cisternae of the SR, open to the outside of the cell, contain extracellular fluid

28
Q

Organization of thick and thin myofilaments within a myofibril is responsible for?

A

Striations in skeletal and cardiac muscle tissue

29
Q

What is the A band?

A

Dark, correspond to the length of the thick myofilaments

30
Q

What is the I band?

A

Light, contain only thin myofilaments

31
Q

What is the Z band?

A

Center of an I band, thin myofilaments are anchored to this

32
Q

Sarcomere

A

Segment of myofibril from one Z line to the next, contractile unit of muscle tissue

33
Q

What is the H zone?

A

Center region of A band