#1
What is the primary function of the muscular system?
Movement
ExplanationFacilitates bodily movement.
#2
Which muscle is commonly known as the 'six-pack'?
Rectus abdominis
ExplanationLocated in the front of the abdomen; forms the 'six-pack' appearance.
#3
What is the main function of the intercostal muscles?
Facilitate breathing
ExplanationExpands and contracts the rib cage during breathing.
#4
Which type of muscle is under voluntary control?
Skeletal muscle
ExplanationMuscle attached to bones; controlled voluntarily.
#5
What is the smallest functional unit of a muscle fiber?
Sarcomere
ExplanationBasic contractile unit of a muscle fiber.
#6
Which connective tissue surrounds the entire muscle?
Epimysium
ExplanationOuter layer of connective tissue surrounding the whole muscle.
#7
Which neurotransmitter is responsible for transmitting signals from nerves to muscles?
Acetylcholine
ExplanationCarries signals across the neuromuscular junction.
#8
Which muscle is responsible for adducting the arm at the shoulder joint?
Pectoralis major
ExplanationBrings arm closer to the body's midline.
#9
Which muscle is responsible for breathing in humans?
Diaphragm
ExplanationContracts and relaxes to change thoracic cavity volume for breathing.
#10
What is the role of creatine phosphate in muscle cells?
Providing energy for muscle contraction
ExplanationQuickly regenerates ATP for muscle energy.
#11
What is the main function of the sarcoplasmic reticulum in muscle cells?
Store calcium ions
ExplanationStores and releases calcium ions for muscle contraction.
#12
In which phase of muscle contraction does the muscle generate the maximum force?
Concentric contraction
ExplanationShortening phase where maximum force is generated.
#13
What is the condition characterized by the inflammation of muscle tissue?
Myositis
ExplanationInflammation of muscle tissue causing weakness and pain.