Muscle Histology
Skeletal Muscle Structure
Major Muscles
Sliding Filament Theory
Muscle Contraction
100
Which muscle type is most abundant in the human body?
Skeletal muscle
100
Myofibrils are composed primarily of what?
Actin & Myosin
100
Where on the body can you find the orbicularis oculi muscle?
Face - around the eyes
100
What are the two components of the thin filament?
Troponin and Tropomyosin
100
Which ion is present surrounding the muscle cell when the muscle is relaxed?
Potassium
200
Label the three muscle types as either voluntary or involunary.
Skeletal: voluntary
Cardiac: involuntary
Smooth: involuntary
200
The _____________ purpose is connecting muscle to bone.
Tendon
200
Where in the body can you find the latissimus dorsi muscle?
200
During a muscle contraction which filament is sliding?
actin towards the M line
200
What is the neurotransmitter for muscle contraction?
Acetylcholine
300
These disks are areas where cells interlock to form very tight bonds, allowing muscle tissue to withstand a great amount of pressure and force over an individual’s lifetime. What are the disks called and which muscle type are they found?
Intercalated disks - cardiac muscle
300
The outermost layer of connective tissue surrounding a skeletal muscle is called the...
Epimysium
300
Where in the body can you find the diaphragm and what is its function?
Inferior to the rib cage - used for breathing
300
In the context of muscle contraction, what does the term 'cross bridge formation' refer to?
The movement where the myosin head attaches to the actin filament and then pulls
300
This feature on the muscle cell is responsible in transmitting a muscles impulse and send the signal into the cell interior...
Transverse tubules
400
What structure connects bone to bone and helps keep joints in place?
Ligament
400
What is a bundle of muscle fibers called that runs parallel to each other and are surrounded by a connective tissue sheath called the perimysium?
Muscle fascicle
400
Where on the body can you find the gastrocnemius muscle?
Calf
400
Which two bands narrow (shorten) during muscle contraction?
H band/zone and the I bands
400
Once the action potential signal is received this part of the myofibril releases stored calcium into the sarcomere.
Sarcoplasmic reticulum
500
Name the muscle cells above. (1-3)
1 - skeletal muscle
2 - smooth muscle
3 - cardiac muscle
500
Describe what origin and insertion mean in terms of muscle identification.
Origin is the muscle point of attachment to a fixed location and insertion is the muscle point of attachment to a movable location
500
Where in the body can you internal and external obliques?
500
When a muscle cell is relaxed the myosin head has ATP attached to it. When calcium is released into the sarcomere what does the ATP break up into once the myosin head attaches to the actin?
ADP and phosphate
500
Put in order these key terms in relation to a muscle contraction: action potential, calcium, transverse tubules, acetylcholine, sodium ions, sarcoplasmic reticulum, & troponin
Transverse tubules, acetylcholine, sodium ions, action potential, calcium from sarcoplasmic reticulum, calcium binds to troponin and then myosin head attach to actin