10 Questions
What is the plasma membrane lining each muscle fibre called?
Sarcolemma
What is the alternate light and dark band pattern in myofibrils due to?
Presence of protein actin and myosin
What elastic fiber is found in the center of each I-band?
Z line
What is the functional unit of muscle contraction called?
Sarcomere
What is the part of thick filament not overlapped by thin filament called?
H zone
What is the role of Acetylcholine in muscle contraction?
Acetylcholine is the neurotransmitter released by neural signals to generate action potential in the sarcolemma.
How do Ca++ ions contribute to muscle contraction?
Ca++ ions released from the sarcoplasmic reticulum activate actin, leading to the formation of cross bridges with myosin.
What distinguishes red muscle fibers from white muscle fibers?
Red fibers contain myoglobin and more mitochondria, while white fibers have fewer myoglobin and mitochondria.
Describe the composition of the axial skeleton.
The axial skeleton includes the skull, vertebral column, sternum, and ribs.
How many bones are present in the human appendicular skeleton?
The human appendicular skeleton consists of bones in the limbs and girdles, totaling 126 bones.
Explore the structure and function of skeletal, visceral, and cardiac muscles. Learn about muscle bundles, muscle fibres, sarcolemma, myofibrils, actin, myosin, I-band, and A-band.
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