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WorksheetsΜυϊκός ιστός και Κατηγορίες Μυών
Total questions: 23
Worksheet time: 12mins
Which type of muscle is voluntary and shows striations under a microscope?
Cardiac muscle, voluntary and unstriated
Cardiac muscle, involuntary and striated
Smooth muscle, involuntary and unstriated
Skeletal muscle, voluntary and striated
Where is cardiac muscle found and what is its control type?
In vessel walls, voluntary control
Only in the heart, involuntary control
Attached to bones, voluntary control
In skin and hair, involuntary control
Match each skeletal muscle part to its description.
Tendon: fibrous connective cord
Belly: thick central region
Insertion: moves during action
Origin: fixed attachment point
Which statement best describes smooth muscle in hollow organs?
Found only in the heart walls
Voluntary control, precise movement
Contracts quickly, fatigues fast
Contracts slowly, propels contents
Select all types of skeletal muscles by shape.
Sphincter muscles
Long muscles
Short muscles
Flat muscles
Cardiac muscles
Which pair correctly matches a multiceps muscle name with heads?
Biceps: three heads
Triceps: four heads
Biceps femoris: four heads
Quadriceps: four heads
What is the main function of sphincter muscles?
Flex joints during running
Close or open body passages
Attach muscle to bone
Pump blood through vessels
Which statement about tendons is true?
They are connective cords
They contain muscle fibers
They make muscles voluntary
They are muscle bellies
Which structures form the thin and thick filaments inside a sarcomere?
Sarcoplasm and sarcolemma
Calcium and ATP molecules
Mitochondria and nuclei
Actin and myosin proteins
What is the role of the sarcolemma in a skeletal muscle fiber?
It is the cell membrane of the fiber
It connects bones to tendons
It stores calcium for contraction
It produces ATP during fatigue
During the sliding filament mechanism, what directly triggers myosin to bind actin?
Increase in muscle tone
Calcium binding to troponin
ATP splitting to ADP
Oxygen entering the fiber
Which statement best describes ATP’s function in muscle contraction?
ATP hardens the sarcolemma
ATP creates actin filaments
ATP detaches myosin heads from actin
ATP removes calcium from fiber
When a motor nerve impulse reaches the muscle, what first happens to start contraction?
Calcium is released from the sarcoplasmic reticulum
Actin filaments shorten and break
Sarcolemma thickens and stiffens
Nuclei move to the fiber center
Which bands or regions change length during contraction according to the sliding filament theory?
Z lines move closer
A band widens
H zone narrows
I band narrows
What term describes the slight, continuous partial contraction that maintains posture?
Muscle tone
Muscle twitch
Muscle fatigue
Muscle tetanus
Muscle fatigue occurs primarily because of which factor during prolonged activity?
Sarcomere number increases
Calcium permanently disappears
Sarcolemma turns into bone
Energy depletion like ATP drop
In a movement, how do the prime mover and antagonist muscles coordinate?
Prime mover contracts, antagonist relaxes
Neither changes their length
Both always contract together
Antagonist initiates every motion
For elbow flexion, which pairing correctly identifies prime mover and antagonist?
Pectoralis prime mover, latissimus antagonist
Forearm flexors as antagonist, deltoid prime mover
Triceps as prime mover, biceps as antagonist
Biceps as prime mover, triceps as antagonist
Which statement about skeletal muscle fibers is accurate?
They have a sarcoplasmic reticulum
They are long cylindrical cells
They contain many nuclei
They lack any striations
What is stored in the sarcoplasmic reticulum and released to start contraction?
Calcium ions
Oxygen gas
Sodium ions
Glucose molecules
Which regions define a sarcomere’s boundaries?
Z lines on either side
H zones at the ends
A bands at the edges
Sarcolemma borders
Which description matches muscles of the trunk?
Made solely of smooth muscle
Attached exclusively to skull
Located only in the limbs
Includes diaphragm and intercostals
Which groups are part of the upper limb musculature?
Pelvic floor muscles
Arm (brachium) muscles
Shoulder girdle muscles
Hand intrinsic muscles
