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WorksheetsUnit 5 Review Muscular System
Total questions: 36
Worksheet time: 18mins
Which of the following is NOT a primary function of the muscular system?
A. Generating body heat
B. Maintaining posture
C. Facilitating movement
D. Producing antibodies
The term that describes a muscle's ability to return to its original shape after being stretched is:
Contractility
Elasticity
Extensibility
Excitability
Which muscle tissue is characterized by being involuntary and having no striations?
Skeletal muscle
Smooth muscle
Cardiac muscle
Striated muscle
Which of these muscle types are considered nonstriated?
Skeletal muscle only
Cardiac muscle only
Smooth muscle only
Both smooth and cardiac muscles
The connective tissue that surrounds individual muscle fibers is called:
Epimysium
Perimysium
Endomysium
Sarcolemma
When an action potential reaches the axon terminal, what type of channel allows calcium to enter?
Myosin-gated channels
Chemically-gated channels
Voltage-gated channels
Ligand-gated channels
What neurotransmitter is released at the neuromuscular junction after calcium enters the axon terminal?
Sodium ions
Potassium ions
Calcium ions
Acetylcholine
Which structure connects muscle tissue to bone?
Sarcomeres
Tendons
Ligaments
Sliding filaments
What structures prevent myosin from binding to actin when a muscle is at rest?
Z-discs and M-lines
Troponin and tropomyosin
Calcium and ATP
Actin and myosin
What structures mark the boundaries between adjacent sarcomeres?
Cross bridges
Active sites
Z-discs
M-lines
The movement of the myosin head that pulls actin filaments toward the center of the sarcomere is known as:
Power stroke
Return stroke
Cross-bridge cycling
ATP contraction
If the deltoid muscle attaches to both the clavicle and the humerus, which attachment point is the insertion?
Clavicle
Humerus
Both are insertions
Neither is an insertion
How many ATP molecules are consumed during each myosin-actin cross-bridge cycle?
1
2
3
4
The burning sensation in muscles during intense exercise is primarily caused by:
Lack of acetylcholine
Lack of oxygen
Lack of calcium
Lack of water
During rigor mortis, what floods the muscle fibers but cannot complete the muscle relaxation process?
Calcium, without ATP
ATP, without calcium
Oxygen, without ATP
ATP, without oxygen
Which structure stores calcium ions that are released during muscle contraction?
Sarcolemma
Sarcoplasmic reticulum
Mitochondria
Myofilaments
Which of these muscle naming conventions is INCORRECT?
Named for location (e.g., tibialis anterior)
Named for shape (e.g., deltoid)
Named for function (e.g., extensor digitorum)
Named for blood supply (e.g., femoral muscle)
Which of the following is an antagonistic muscle pair?
Biceps brachii and triceps brachii
Deltoid and trapezius
Rectus abdominis and external oblique
Quadriceps and hamstrings
When a muscle contracts, what happens to the sarcomere length?
It increases
It decreases
It remains unchanged
It first increases, then decreases
The process where calcium ions bind to troponin, causing a conformational change in tropomyosin is called:
Excitation-contraction coupling
Neuromuscular transmission
Calcium-troponin binding
Sliding filament mechanism
Which statement about fast-twitch muscle fibers is FALSE?
They fatigue quickly
They have high oxidative capacity
They are used in powerful movements
They have more glycolytic enzymes than slow-twitch fibers
The primary energy source for immediate muscle contraction is:
Glucose
Glycogen
ATP
Creatine phosphate
What happens during muscle fatigue?
Increased calcium release
Decreased lactic acid production
Decreased ATP availability
Increased oxygen delivery
Which of these is NOT a characteristic of cardiac muscle?
Has intercalated discs
Contains multiple nuclei
Contracts involuntarily
Has striations
The thick filaments in muscle fibers are primarily composed of:
Actin
Myosin
Troponin
Tropomyosin
Which of the following is NOT a function of the epimysium?
Separating the muscle from surrounding tissues
Providing attachment points for tendons
Storing calcium ions for muscle contraction
Protecting the muscle from friction damage
Which muscle would be the prime mover when extending your arm at the elbow?
Biceps brachii
Triceps brachii
Brachialis
Deltoid
During eccentric contraction, muscles:
Shorten while generating force
Lengthen while generating force
Maintain the same length while generating force
Do not generate any force
The neuromuscular junction is an example of:
Electrical synapse
Chemical synapse
Gap junction
Tight junction
What is the correct sequence of events in muscle contraction?
Calcium release → Action potential → Acetylcholine release → Cross-bridge formation
Action potential → Calcium release → Acetylcholine release → Cross-bridge formation
Action potential → Acetylcholine release → Calcium release → Cross-bridge formation
Acetylcholine release → Action potential → Calcium release → Cross-bridge formation
Which statement about isometric contractions is TRUE?
The muscle shortens during contraction
The muscle lengthens during contraction
The muscle length remains unchanged during contraction
The muscle does not use any energy during contraction
The sliding filament theory explains:
How muscles are named
How muscles attach to bones
How muscles generate force and movement
How muscles store energy
What is the function of mitochondria in muscle cells?
Store calcium ions
Produce ATP
Synthesize myosin
Release acetylcholine
Which of these muscles is NOT found in the anterior compartment of the thigh?
A. Rectus femoris
B. Vastus lateralis
C. Biceps femoris
D. Vastus medialis
Which of the following is NOT a function of antibodies?
Neutralizing toxins
Activating complement system
Opsonization
Producing antibodies
Which of the following is a property of muscle tissue?
Contractility
Elasticity
Excitability
Extensibility
