Q.1 Which type of muscle is responsible for voluntary movements?
Cardiac muscle
Smooth muscle
Skeletal muscle
Involuntary muscle
Explanation - Skeletal muscles are under voluntary control and enable body movements by attaching to bones.
Correct answer is: Skeletal muscle
Q.2 Where is cardiac muscle found in the body?
Lungs
Stomach
Heart
Kidneys
Explanation - Cardiac muscle is found exclusively in the walls of the heart and is responsible for pumping blood.
Correct answer is: Heart
Q.3 Which of the following is an involuntary muscle?
Biceps
Quadriceps
Smooth muscle
Deltoid
Explanation - Smooth muscles are involuntary and are found in the walls of hollow organs such as the stomach and intestines.
Correct answer is: Smooth muscle
Q.4 What is the primary function of muscles?
Digestion
Hormone secretion
Movement
Blood filtration
Explanation - Muscles contract and relax to produce movement of body parts.
Correct answer is: Movement
Q.5 Which muscle is known as the 'calf muscle'?
Biceps femoris
Gastrocnemius
Deltoid
Trapezius
Explanation - The gastrocnemius muscle, located in the back of the lower leg, forms the bulk of the calf.
Correct answer is: Gastrocnemius
Q.6 Which type of muscle tissue has striations but is involuntary?
Smooth muscle
Cardiac muscle
Skeletal muscle
None
Explanation - Cardiac muscle is striated like skeletal muscle but is involuntary in function.
Correct answer is: Cardiac muscle
Q.7 What connects muscles to bones?
Ligaments
Cartilage
Tendons
Fascia
Explanation - Tendons are fibrous connective tissues that attach muscles to bones, allowing movement.
Correct answer is: Tendons
Q.8 Which muscle is primarily responsible for breathing?
Diaphragm
Deltoid
Latissimus dorsi
Pectoralis major
Explanation - The diaphragm contracts and relaxes to facilitate inhalation and exhalation.
Correct answer is: Diaphragm
Q.9 Which of the following is NOT a function of muscles?
Maintaining posture
Producing heat
Storing calcium
Movement
Explanation - Bones, not muscles, store calcium. Muscles are responsible for movement, posture, and heat generation.
Correct answer is: Storing calcium
Q.10 Which muscle is located in the upper arm and helps in flexion of the elbow?
Biceps brachii
Triceps brachii
Deltoid
Pectoralis minor
Explanation - The biceps brachii is located in the upper arm and is responsible for flexing the elbow joint.
Correct answer is: Biceps brachii
Q.11 What type of muscle contraction occurs when a muscle shortens while producing force?
Isometric contraction
Eccentric contraction
Concentric contraction
Relaxation
Explanation - In concentric contraction, the muscle shortens as it generates force, such as in lifting weights.
Correct answer is: Concentric contraction
Q.12 Which muscle forms the bulk of the shoulder?
Trapezius
Deltoid
Latissimus dorsi
Pectoralis major
Explanation - The deltoid muscle covers the shoulder joint and gives the shoulder its rounded shape.
Correct answer is: Deltoid
Q.13 Which ion is essential for muscle contraction?
Sodium
Calcium
Potassium
Chloride
Explanation - Calcium ions trigger the interaction between actin and myosin, enabling muscle contraction.
Correct answer is: Calcium
Q.14 The smallest functional unit of a muscle fiber is called:
Myofibril
Sarcomere
Filament
Mitochondrion
Explanation - The sarcomere is the structural and functional unit of a muscle fiber responsible for contraction.
Correct answer is: Sarcomere
Q.15 Which protein forms the thin filaments in muscle fibers?
Myosin
Actin
Keratin
Collagen
Explanation - Actin filaments interact with myosin heads to generate muscle contraction.
Correct answer is: Actin
Q.16 What type of energy molecule is primarily used in muscle contraction?
ATP
DNA
Glucose
NADH
Explanation - Adenosine triphosphate (ATP) provides the energy required for cross-bridge cycling in muscles.
Correct answer is: ATP
Q.17 Which muscle is commonly referred to as the 'abs'?
Rectus femoris
Rectus abdominis
Obliques
Latissimus dorsi
Explanation - The rectus abdominis muscle is located in the abdomen and is popularly known as the 'abs'.
Correct answer is: Rectus abdominis
Q.18 What type of muscle is found in the walls of blood vessels?
Skeletal muscle
Cardiac muscle
Smooth muscle
Striated muscle
Explanation - Smooth muscle lines the walls of hollow organs including blood vessels to regulate diameter.
Correct answer is: Smooth muscle
Q.19 Which muscle is known as the 'chewing muscle'?
Masseter
Temporalis
Orbicularis oculi
Trapezius
Explanation - The masseter muscle is one of the strongest muscles and is primarily responsible for chewing.
Correct answer is: Masseter
Q.20 Which of these muscles is part of the quadriceps group?
Biceps femoris
Rectus femoris
Gastrocnemius
Gluteus maximus
Explanation - The quadriceps group includes rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
Correct answer is: Rectus femoris
Q.21 Which neurotransmitter is released at the neuromuscular junction?
Serotonin
Acetylcholine
Dopamine
Norepinephrine
Explanation - Acetylcholine is the neurotransmitter that stimulates muscle fibers at the neuromuscular junction.
Correct answer is: Acetylcholine
Q.22 Which muscle helps in winking or closing the eye?
Orbicularis oris
Orbicularis oculi
Zygomaticus
Frontalis
Explanation - The orbicularis oculi muscle encircles the eye and enables blinking and winking.
Correct answer is: Orbicularis oculi
Q.23 Muscle fatigue is primarily caused by the accumulation of which substance?
Lactic acid
Carbon dioxide
ATP
Calcium
Explanation - During anaerobic respiration, lactic acid accumulates in muscles, leading to fatigue.
Correct answer is: Lactic acid
Q.24 Which muscle forms the buttocks?
Gluteus maximus
Rectus femoris
Psoas major
Iliacus
Explanation - The gluteus maximus is the largest muscle in the buttocks, responsible for hip extension.
Correct answer is: Gluteus maximus
Q.25 What is the name of the connective tissue covering each individual muscle fiber?
Endomysium
Perimysium
Epimysium
Sarcolemma
Explanation - The endomysium surrounds each individual muscle fiber within a fascicle.
Correct answer is: Endomysium