24 Questions
What is the percentage of body weight made up of skeletal muscles?
40%
What is the role of skeletal muscles in maintaining body temperature?
Breaking down ATP to produce heat
How do skeletal muscles move the body?
By contracting and pulling
What is the function of skeletal muscles in the body's circulatory system?
Pumping blood in veins and lymph back to the heart
What can skeletal muscles do to bones?
Only pull bones
How do skeletal muscles work?
In pairs and in groups
What is the function of an antagonist muscle?
To act opposite to the prime mover
What is the term for the cell membrane of muscle fibers?
Sarcolemma
What is the main function of the perimysium?
To enclose the entire muscle
What is the role of the endomysium?
To transfer force produced by the muscle fibers to the tendons
What is the function of the sarcoplasmic reticulum?
To store and release calcium ions
What is the structure of a skeletal muscle fiber?
Cylindrical, containing many myofibrils
What is the contractile portion of a muscle cell?
Myofibrils
What is the functional unit of a skeletal muscle fiber?
Sarcomere
What is the function of mitochondria in skeletal muscle fibers?
To provide energy to the muscle fibers
What is the term for the cytoplasm of a skeletal muscle fiber?
Sarcoplasm
What is the composition of the thick filaments in a sarcomere?
Myosin protein
What is the effect of the shortening of individual sarcomeres?
Contraction of muscle fibers
What is the function of the globular head in myosin?
To hydrolyze ATP
What is the organization of myosin proteins in a thick filament?
Heads towards the Z-discs and tails towards the M-line
What is the composition of thin myofilaments?
Two intertwining strands of actin
What is the role of troponin and tropomyosin in muscle contraction?
To regulate the binding of myosin to actin
What occurs during muscle contraction according to the Sliding Filament Model?
The filaments slide past each other
What is the structural organization of actin monomers in a thin filament?
Intertwining strands of actin with myosin binding sites
Learn about the function and types of skeletal muscles, their control by the somatic nervous system, and their role in maintaining posture, balance, and body movement. Understand the importance of skeletal muscles in the human body.
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