#1
Which type of muscle is under voluntary control?
Smooth muscle
Cardiac muscle
Skeletal muscle
Involuntary muscle
#2
What is the term for the ability of a muscle to stretch without being damaged?
Flexibility
Contractility
Elasticity
Tonus
#3
What is the role of ATP (adenosine triphosphate) in muscle contraction?
Provides structural support to muscles
Stores genetic information in muscles
Supplies energy for muscle contractions
Regulates muscle temperature
#4
Which neurotransmitter is responsible for muscle relaxation?
Dopamine
Serotonin
Norepinephrine
Gamma-aminobutyric acid (GABA)
#5
What is the primary energy source for muscle contractions during high-intensity activities?
Glucose
Fatty acids
Lactic acid
Creatine phosphate
#6
What is the main function of cardiac muscles?
Movement of bones
Pumping blood
Digestion
Contraction of organs
#7
Which protein is directly involved in muscle contraction?
Insulin
Myoglobin
Actin
Hemoglobin
#8
Which of the following is a characteristic of fast-twitch muscle fibers?
High endurance
Slow contraction speed
Aerobic metabolism
Quick and powerful contractions
#9
What is the neuromuscular junction?
The point where two muscles meet
The connection between nerves and muscles
A specialized type of muscle fiber
A joint between bones
#10
Which type of muscle contraction occurs when the muscle lengthens under tension?
Isotonic contraction
Eccentric contraction
Isometric contraction
Concentric contraction
#11
What is the main function of satellite cells in muscle tissue?
Store glycogen for energy
Initiate muscle contraction
Repair and regenerate muscle fibers
Produce neurotransmitters
#12
What is the function of the sarcoplasmic reticulum in muscle cells?
Energy production
Calcium storage
Protein synthesis
Cellular respiration
#13
Which neurotransmitter is responsible for transmitting signals from nerves to muscles?
Serotonin
Dopamine
Acetylcholine
GABA
#14
Which hormone stimulates muscle growth and protein synthesis?
Insulin
Estrogen
Growth hormone
Thyroxine
#15
In which phase of muscle contraction does the muscle generate the greatest force?
Isometric contraction
Eccentric contraction
Concentric contraction
Isotonic contraction
#16
Which muscle is responsible for the flexion of the forearm?
Biceps brachii
Triceps brachii
Rectus femoris
Soleus
#17
What is the term for the connective tissue that surrounds a bundle of muscle fibers?
Endomysium
Epimysium
Perimysium
Myofibril