Functions
A function of the muscular system that refers to the contraction of the skeletal muscles of the thoracic cage, as well as the diaphragm.
A.Respiration
B.Oxygen Delivery
C.Circulatory Assistance
D.Voluntary Control of Muscles
A.Respiration
Which type of muscle is responsible for voluntary body movements, such as walking or typing?
A. Cardiac muscle
B. Smooth muscle
C. Skeletal muscle
D. Striated smooth muscle
C. Skeletal Muscle
Which connective tissue layer surrounds the entire skeletal muscle?
A. Endomysium
B. Perimysium
C. Epimysium
D. Sarcolemma
C. Epimysium
Which ion is essential for muscle contraction to occur?
A. Sodium
B. Potassium
C. Calcium
D. Magnesium
C. Calcium
Which of the following is NOT a function of the muscular system?
A. Communication
B. Regulation of blood sugar levels
C. Production of body heat
D. Maintenance of posture
B. Regulation of blood sugar levels
Skeletal muscles are involved in speaking,
writing, typing, gesturing, and facial expressions.
A.Interaction
B.Communication
C.Coordination
D.Expression
B. Communication
Which type of muscle tissue is found in the walls of hollow organs and blood vessels?
A. Cardiac muscle
B. Smooth muscle
C. Skeletal muscle
D. Elastic muscle
B. Smooth Muscle
What is the name of the connective tissue layer that groups muscle fibers into fascicles?
A. Epimysium
B. Endomysium
C. Sarcomere
D. Perimysium
D. Perimysium
What happens when a muscle contracts?
A. The muscle gets shorter.
B. The muscle becomes longer.
C. The sarcomere gets wider.
D. Tropomyosin blocks the actin filament.
A. The muscle gets shorter.
Elasticity allows muscles to stretch beyond their normal length.
True or False
False
Contraction of skeletal muscles is responsible for walking, running, and manipulating objects with the hands.
A.Body Movement
B.Mechanical Work
C.Fine Motor Skills Coordination
D.Maintenance of Posture
A.Body Movement
This type of muscle is involuntary and autorhythmic, ensuring the consistent pumping of blood throughout the body.
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Myocardial skeletal muscle
C. Cardiac Muscle
The innermost connective tissue layer that separates individual muscle fibers is called:
A. Sarcoplasmic reticulum
B. Endomysium
C. Perimysium
D. Fascicle sheath
B. Endomysium
During contraction, what structure shortens within the muscle fiber?
A. Myosin filaments
B. Actin filaments
C. Sarcomere
D. Sarcolemma
C. Sarcomere
You observe a patient’s muscle biopsy under a microscope and see prominent striations and multiple nuclei. These characteristics indicate which type of muscle?
A. Smooth muscle
B. Cardiac muscle
C. Skeletal muscle
D. Fascial muscle
C. Skeletal muscle
Skeletal muscles constantly maintain tone, which keeps us sitting or standing erect.
Posture / Maintenance of Posture
The ability of a muscle to be stretched beyond its normal resting length and still contract is known as what?
Extensibility
What neurotransmitter is released at the neuromuscular junction to stimulate muscle contraction?
Acetylcholine
What is the primary energy source for muscle contraction?
ATP
After a stroke, a patient has trouble moving their left arm in response to verbal commands. Which property of muscle tissue is likely affected?
Excitability
When skeletal muscles contract, ______ is given off as a by-product.
Heat
What is the ability of a muscle to respond to a stimulus called?
Excitability
Myofibrils are primarily composed of which two types of myofilaments?
Actin and Myosin
Which structure is the smallest functional unit of a muscle fiber?
Sarcomere
A swimmer is unable to generate the necessary force to push off the pool wall during a race. Which muscle property is failing?
Contractility