lecture 14 muscle Flashcards by Davis Kuriakose

Q

What ar ethe characteristics of skeletal muscle?

A

Multinucleated synctium
formed during embryonic development when hundreds of induvdual mononucleared myoblasts join end to end to form myotube
myotube matures into multinucleaed myocytes
peripheral nuclei
sarcomeric arrangement
fiber innvervated by single motor axon
contraction = all or none
Contains troponin C 50 ti 60 nanometers in Diameter

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Q

What is a type 1 muscle fiber?

A

Intense staining for oxidative enzymes

Rich in NADH transferase , myoglobin, and they possess may mitochondria

Primarily unitlize oxidatiev phophorlaytion

Produce slow and continuous contractions

Dark red fibers

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Q

What is a type 2A muscle fiber?

A

Intermediate staining for oxidative enzymes for oxidative enzymes

utilize both aerobic and anaerobic respiration for ATP production

Contract more rapidly than 1 type fibers

resistance to fatigue

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Q

What is a Type 2B muscle fiber

A

light staining for oxidative enzymes

utilize primarily anaerobic respiration for ATP production

Rich in ATPase

Contract more rapidly than type 1 or type 2A fibers

Fatigure quickly reffered to as white or light fiber

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Q

what type of stain and fiber?

A

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Q

What are smooth muscles?

A

single mononucleated cels
no sarcomeric arrangement
cells innervated via ANS
- Do not respond “ all or none”
Cells connect via gap junctions

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Q

What tissue is this?

A

smooth

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Q

What tissue is this?

A

Smooth

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Q

What tissue is this?

A

SMOOTH

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Q

What tissue is this?

A

Smooth

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Q

What is cardiac tissue?

A

SIngle mononucleated cells
centrally positioned nuclei
cells often branched
sarcomeric arrangement
cells communicate via gap junctions
- Intercalated discs
Cells directly innervated

Q

What tissue is this?

A

Cardiac tissue

Q

What tissue is this?

A

cardiac

Q

What tissue is this?

A

cardiac

Q

What is the heirarchy of skeletal muscle

A

Muscle

many Fasicile

bundle myofibers

bundle myofibrils

linear array of sarcomeres

filaments

thin = acint ; thicc = myosin

Q

What surrounds hierchy of skeletal muscle?

A

EPimysium covers muscle
PERImysium covers fasicle (fibroblasts +type 1 collagen)
Sarcolemma (cell membrane) covers myofiber ( muscle cell)
ENDOmyosum covers myofiber too

Consists of basal lamina and reticular fibers
secreated via muscle cells
anchors fibers to ea other (distributes fore of contraction)

Q

What is the structure of a sarcomere

A

during contraction distance between z lines become shorter (decreased length in sarcomere)

Q

A