Which type of muscle is voluntary?
A) Cardiac
B) Smooth
C) Skeletal ✅
D) Involuntary Explanation: Skeletal muscles are under conscious control.
Which muscle type is found in the heart?
A) Skeletal
B) Smooth
C) Cardiac ✅
D) Voluntary Explanation: Cardiac muscle is specialized and involuntary, found only in the heart.
Which muscle type is involuntary and non-striated?
A) Skeletal
B) Smooth ✅
C) Cardiac
D) Voluntary Explanation: Smooth muscle is found in internal organs like intestines and blood vessels.
Which protein is responsible for muscle contraction?
A) Hemoglobin
B) Insulin
C) Actin and myosin ✅
D) Keratin Explanation: Actin and myosin filaments slide past each other during contraction.
Which of the following muscles is under conscious control?
A) Heart
B) Intestine
C) Biceps ✅
D) Lungs Explanation: Biceps are skeletal muscles controlled voluntarily.
Where are smooth muscles found?
A) Arms
B) Lungs
C) Intestines ✅
D) Heart Explanation: Smooth muscles line hollow internal organs.
Cardiac muscle is:
A) Voluntary and striated
B) Involuntary and non-striated
C) Involuntary and striated ✅
D) Voluntary and non-striated Explanation: Cardiac muscle is striated like skeletal muscle but functions involuntarily.
The basic unit of a muscle fiber is the:
A) Myosin
B) Sarcomere ✅
C) Actin
D) Fiber Explanation: Sarcomeres are the structural units where contraction occurs.
Which connective tissue surrounds individual muscle fibers?
A) Perimysium
B) Epimysium
C) Endomysium ✅
D) Myofibril Explanation: Endomysium encases each individual muscle fiber.
Which muscle contracts when you smile?
A) Deltoid
B) Biceps
C) Zygomaticus ✅
D) Masseter Explanation: The zygomaticus pulls the mouth’s corners upward.
Muscles are attached to bones by:
A) Ligaments
B) Cartilage
C) Tendons ✅
D) Fascia Explanation: Tendons connect muscle to bone.
What is the function of the diaphragm?
A) Heartbeat
B) Digestion
C) Breathing ✅
D) Blinking Explanation: The diaphragm helps in the mechanics of inhalation.
Which of the following is a facial muscle?
A) Triceps
B) Masseter ✅
C) Deltoid
D) Quadriceps Explanation: The masseter assists in chewing.
Which muscle group is found in the front of the thigh?
A) Hamstrings
B) Triceps
C) Quadriceps ✅
D) Gluteals Explanation: Quadriceps extend the knee.
Which muscle helps in arm abduction?
A) Biceps
B) Trapezius
C) Deltoid ✅
D) Pectoralis major Explanation: Deltoid lifts the arm away from the body.
Muscle contraction requires which energy molecule?
A) DNA
B) ATP ✅
C) RNA
D) Glucose Explanation: ATP provides energy for muscle contraction.
Which muscle is known as the calf muscle?
A) Sartorius
B) Hamstring
C) Gastrocnemius ✅
D) Tibialis Explanation: The gastrocnemius forms the bulk of the calf.
Which type of muscle tires the fastest?
A) Cardiac
B) Smooth
C) Skeletal ✅
D) Involuntary Explanation: Skeletal muscles fatigue faster than the other types.
Muscles that work in pairs are called:
A) Antagonistic ✅
B) Cooperative
C) Agonistic
D) Flexors Explanation: One muscle contracts while the other relaxes.
Which is the longest muscle in the human body?
A) Biceps
B) Sartorius ✅
C) Rectus abdominis
D) Triceps Explanation: Sartorius runs from the hip to the knee.
🟡 Moderate Level (21–40)
Which part of the sarcomere shortens during contraction?
A) Z-line
B) H-zone ✅
C) A-band
D) Myofibril Explanation: The H-zone narrows as actin and myosin overlap.
The neurotransmitter at the neuromuscular junction is:
A) Dopamine
B) GABA
C) Acetylcholine ✅
D) Serotonin Explanation: Acetylcholine initiates muscle contraction.
The muscle responsible for blinking is the:
A) Masseter
B) Orbicularis oculi ✅
C) Buccinator
D) Zygomaticus Explanation: Orbicularis oculi closes the eyelids.
Which is a flexor muscle of the forearm?
A) Triceps
B) Biceps ✅
C) Deltoid
D) Latissimus dorsi Explanation: Biceps help bend the elbow.
The sliding filament theory involves interaction between:
A) Tendons and bones
B) Actin and myosin ✅
C) Ligaments and tendons
D) Calcium and potassium Explanation: Muscle contraction results from actin sliding over myosin.
The point where a muscle attaches to a stationary bone is called the:
A) Insertion
B) Origin ✅
C) Joint
D) Belly Explanation: Origin is the fixed attachment point.
Tetanus in muscles refers to:
A) Muscle paralysis
B) Sustained contraction ✅
C) Muscle growth
D) Relaxation Explanation: Tetanus is continuous muscle contraction without relaxation.
What is the role of calcium in muscle contraction?
A) Forms ATP
B) Binds to troponin ✅
C) Converts actin to myosin
D) Inhibits contraction Explanation: Calcium binds to troponin to expose binding sites on actin.
Which enzyme breaks down acetylcholine?
A) Amylase
B) Acetylcholinesterase ✅
C) Lipase
D) Kinase Explanation: It terminates the signal at the neuromuscular junction.
Muscle fatigue is primarily caused by:
A) Lack of oxygen ✅
B) Muscle growth
C) Excess protein
D) Cold temperature Explanation: Anaerobic respiration leads to lactic acid buildup.
Which muscle stabilizes the shoulder joint?
A) Deltoid
B) Trapezius
C) Rotator cuff muscles ✅
D) Pectoralis Explanation: These muscles hold the humerus in place.
Which muscle elevates the mandible during chewing?
A) Orbicularis oris
B) Temporalis ✅
C) Buccinator
D) Platysma Explanation: Temporalis helps in mastication.
Which of these is a deep core muscle?
A) External oblique
B) Rectus abdominis
C) Transverse abdominis ✅
D) Gluteus maximus Explanation: Transverse abdominis stabilizes the spine.
Which mineral is crucial for muscle contraction?
A) Iron
B) Calcium ✅
C) Magnesium
D) Zinc Explanation: Calcium ions trigger the contraction process.
Which muscle helps in rotating the head?
A) Deltoid
B) Sternocleidomastoid ✅
C) Trapezius
D) Pectoralis Explanation: This muscle helps in head flexion and rotation.
Muscle tone refers to:
A) Muscle mass
B) State of partial contraction ✅
C) Total contraction
D) Flaccidity Explanation: Even relaxed muscles are slightly contracted.
Which is not a function of the muscular system?
A) Movement
B) Posture
C) Heat production
D) Hormone secretion ✅ Explanation: Hormones are secreted by glands, not muscles.
Myoglobin in muscles stores:
A) Glucose
B) Oxygen ✅
C) Carbon dioxide
D) Nitrogen Explanation: Myoglobin binds oxygen for use during contraction.
A muscle that assists the prime mover is called a:
A) Fixator
B) Synergist ✅
C) Antagonist
D) Origin Explanation: Synergists aid in the movement.
What is a motor unit?
A) One muscle
B) One neuron and all the muscle fibers it controls ✅
C) One sarcomere
D) Muscle and bone Explanation: It includes a motor neuron and its associated muscle fibers.
🔴 Hard Level (41–50)
Which band remains constant during muscle contraction?
A) A-band ✅
B) I-band
C) H-zone
D) Z-line Explanation: A-band contains overlapping actin and myosin and stays the same.
Fast-twitch muscle fibers are best suited for:
A) Endurance
B) Marathon running
C) Short bursts of strength and speed ✅
D) Digestion Explanation: These fibers contract quickly and fatigue rapidly.
Which condition causes progressive muscle degeneration?
A) Arthritis
B) Muscular dystrophy ✅
C) Rickets
D) Myasthenia gravis Explanation: Muscular dystrophy is a genetic disorder.
Which receptor binds acetylcholine in muscles?
A) Dopamine receptor
B) Nicotinic receptor ✅
C) Muscarinic receptor
D) GABA receptor Explanation: Nicotinic receptors mediate skeletal muscle responses.
Rigor mortis occurs due to lack of:
A) Oxygen
B) Glucose
C) ATP ✅
D) Calcium Explanation: Without ATP, muscles remain contracted after death.
Creatine phosphate is used for:
A) Muscle fatigue
B) Prolonged contraction
C) Short-term ATP regeneration ✅
D) Muscle atrophy Explanation: It quickly donates phosphate to ADP.
Which filament is anchored to the Z-line?
A) Myosin
B) Actin ✅
C) Tropomyosin
D) Troponin Explanation: Actin is a thin filament attached at the Z-line.
Which disease affects neuromuscular transmission?
A) Diabetes
B) Osteoporosis
C) Myasthenia gravis ✅
D) Parkinson’s Explanation: It’s an autoimmune disorder affecting acetylcholine receptors.
Which organelle in muscle cells stores calcium?
A) Mitochondria
B) Sarcoplasmic reticulum ✅
C) Nucleus
D) Ribosome Explanation: It regulates calcium release for contraction.
During isotonic contraction:
A) Muscle changes length ✅
B) Tension doesn’t change
C) Muscle doesn’t shorten
D) No ATP is used Explanation: Isotonic contractions involve movement.