WorksheetsThe Muscular System
Total questions: 20
Worksheet time: 2hrs 40mins
Cardiac Muscle Characteristics (Select all that apply)
Found only in the heart
Branching Cells
Involuntary
No striations
Usually has multiple nucleus
Skeletal Muscle Functions include
Produce movement
Maintain posture
Stabilize joints
Generate heat
What is the sarcolemma?
Long organelles inside muscle cell
Specialized sooth endoplasmic reticulum
Specialized plasma membrane
A contractile unit of a muscle fiber? Sarcomere or Myofilaments
(a)
What does the thick filaments have?
Composed of the protein filaments
Anchored to the Z disc
Has ATPase enzymes
Myosin filaments have heads
Mysoin actin overlap somewhat
Which filament has actin filaments, composed of protein actin, and anchored to the Z disc? Thin or Thick
(a)
At rest, there is a bare zone that lacks actin filaments called what?
The H zone
The C zone
The Sarcoplasmic reticulum (SR) does what?
Stores and releases calcium
Long organelles inside muscle cells
Surrounds the myofibril
Excitability means?
Ability to shorten when an adequate stimulus is received
Ability to recoil and resume resting length after stretching
Ability to receive and respond to a stimulus
Ability of muscle cells to be stretched
A synaptic cleft is?
Gap between nerve and muscle
Nerve and muscle do not make contact
Nerve muscle do make contact
Area between nerve and muscle is filled with interstitial fluid
A neurotransmitter is a chemical released by nerve upon arrival of nerve impulse
True
False
Is this in order?
1. Activation by nerve causes myosin heads (cross bridges) to attach to binding sites on the thin filament
2. Myosin heads then bind to the next site of the thin filament and pull them toward the center of the sarcomere
3. This continued action causes a sliding of the myosin along the actin
4. The result is that the muscle is shortened (contracted)
Yes, it is in order
No, it is not in order
The three basic muscle types are found in the body
Skeletal
Cardiac
Smooth
What prefixes refer to muscle?
Myo
Musc
Mys
Myuo
Skeletal Muscles are...?
Involuntary
Voluntary
Cardiac muscle is..?
Voluntary
Involuntary
The site that is NOT muscle attachment
Bones
Hair
Cartilage
Connective tissue coverings
What do tendons NOT have?
Cord-like structures
Sheet-like structures
Mostly collagen fibers
Often cross a joint due to toughness and small size
Where is smooth muscle found in?
Mainly in the walls of hollow organs
The heart and brain
True or false/ the cardiac muscle is found in more than one place in the body?
False
True
