13.9 Voluntary and involuntary muscles Flashcards by Preet Bajwa | Brainscape

Q

what are the 3 types of muscle?

A

skeletal
cardiac
smooth

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Q

function of skeletal muscle?

A

responsible for movement

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Q

function of cardiac muscle?

A

found in heart and contract without stimulus

ensures regular heart rhythm

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Q

function of smooth muscle?

A

INVOLUNTARY MUSCLE

found in blood vessels

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Q

skeletal muscle properties

A

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Q

cardiac muscle properties

A

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Q

smooth muscle properties

A

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Q

what is this?

A

skeletal muscle

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Q

what is this?

A

cardiac muscle

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Q

what is this?

A

smooth muscle

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Q

what are the units of muscle fibres?

A

sarcolemma

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Q

what is the cytoplasm of a muscle fibre?

A

sarcoplasm

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Q

what organelle is common in muscle cells?

A

mitochondria
to provide ATP

and glycogen granules
to provide glucose for respiration

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Q

what is contained in the sarcoplasmic reticulum?

A

Ca2+ ions

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Q

what are myofibrils?

A

protein organelles specialised for contraction

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Q

what is myofibril made out of?

A

actin
myosin

Q

what is actin?

A

acTHIN
two strands twisted around eachother

Q

what is myosin?

A

THICK
contains myosin heads

Q

what is a light band or I-band?

A

regions of ONLY actin and NO mysoin

Q

what is a dark band or A-band?

A

darker regions where actin and myosin DO OVERLAP

Q

what is the Z-line?

A

line at the end of each light band

Q

what is between 2 Z-lines?

A

a sarcomere

Q

what happens to the sarcomere when contracted?

A

it shortens

Q

what is the H-zone?

A

regions of only myosin

Q

what happens to the H-zone when muscle contracts?

A

it decreases

Q

what happens to the A-zone when muscle contracts?

A

it stays the same

Q

what happens to the I-zone when muscle contracts?

A

it decreases

Q

what happens to the H-zone when muscle contracts?

A

it decreases

Q

cross section of H zone

A

contains only thick myosin

Q

cross section of A zone

A

contains both myosin and actin

Q

diagram of myofibril

A