Muscle Microanatomy

Muscle Microanatomy

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​Muscle microanatomy terms

This is from largest to smallest... Muscle, fasicle, fiber (a muscle cell), myofibril, sarcomere, myofilaments. Other special muscle fiber structures are parts of the sarcomere (z lines or disks, A band, I band), sarcolemma (muscle cell membrane), sarcoplasm (muscle cell cytoplasm), sarcoplasmic reticulum goes around the cell fiber and stores calcium and transverse tubules

Subject | Subject

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​Microanatomy you need to know

​Sarcolemma, sarcoplasmic reticulum, transverse tubules, Sarcomere, myosin and actin (protein filaments in fiber), Aband, I band and Z lines/disks

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Subject | Subject

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Multiple Select

Which of the following belong in a muscle FIBER? (check all that apply)

• T Tubules

• Myofibrils

• sarcoplasmic reticulum

• perimysium

• neuromuscular junction

Open Ended

How are cardiac muscle cells different from skeletal muscle cells? How are smooth muscle cells uniquely different from cardiac and skeletal fibers?

Multiple Choice

How do cardiac and skeletal muscles get their striations? (aka "lines")

• pattern of actin and myosin in sarcomeres

• lines on the sarcolemma

• T-tubules

• Z-lines

Multiple Choice

identify

• cardiac
• smooth
• skeletal

Multiple Choice

List the structures of a muscle from smallest to largest

• myofibril, muscle fiber, fascicle, muscle
• fascicle, muscle, myofibril, muscle fiber
• fascicle, sarcomere, muscle, muscle fiber
• myofibril, muscle, fascicle, sarcomere

Multiple Choice

Identify

• smooth
• cardiac
• skeletal

Multiple Choice

identify

• smooth
• cardiac
• skeletal

Multiple Choice

found in heart

• smooth
• cardiac
• skeletal

Multiple Choice

attached to bones

• cardiac
• smooth
• skeletal

Multiple Choice

intercalated disks

• smooth
• cardiac
• skeletal

Multiple Select

Identify the muscle tissue(s) that would show striations.

• smooth

• cardiac

• skeletal

Multiple Choice

Spindle shaped cells under involuntary control, usually found in organs.

• cardiac

• smooth

• skeletal

Multiple Choice

Myofibrils are made up of two types of proteins known as?

• Actin and Myosin
• Troponin and Tropomyosin
• Myoglobin and hemoglobin
• none of these

Multiple Choice

What is the name of the thick myofilaments in the sarcomere?

• Actin

• Myosin

• Myoglobin

• Troponin

• Tropomyosin

Multiple Choice

The contractile unit of a muscle is called the __________.

• Sarcolemma
• Sarcoplasmic reticulum
• Sarcoplasm
• Sarcomere

Multiple Choice

The actin is represented by the letter

• A
• B
• C
• D

Multiple Choice

Myosin is represented by

• A

• B

• C

• D

Multiple Choice

What zone/band of the sarcomere is represented by pink.

• I Zone/Band
• A Zone/Band
• H Zone/Band
• M Zone/Band

Multiple Choice

List the structures of a muscle from smallest to largest

• sarcomere, myofibril, myocyte, fascicle, muscle organ

• fascicle, muscle organ, myofibril, myocyte, sarcomere

• fascicle, sarcomere, muscle, myocyte, muscle organ

• myofibril, sarcomere, myocyte, muscle organ, fascicle

Multiple Choice

What is the name of the molecule that has heads and pulls the actin towards the M line of the sarcomere?

• actin

• troponin

• myosin

• ATP

Multiple Choice

What zone/band of the sarcomere is represented by yellow.

• I Zone/Band
• A Zone/Band
• H Zone/Band
• M Zone/Band

Multiple Choice

What state is the sarcomere in #1

• Relaxed
• Contracting
• Fully Contracted
• None of the above