Multiple Choice
Which selection correctly describes the role of calcium in signal transduction during cell communication?
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4. Tissues & Histology
Introduction to Muscle Tissue
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Why are skeletal and cardiac muscles striated?
A
Because they contain sarcomeres with alternating bands of actin and myosin filaments.
B
Because they have a high density of mitochondria for energy production.
C
Because they are composed of smooth muscle fibers.
D
Because they are controlled by the autonomic nervous system.
Verified step by step guidance1
Understand the structure of muscle fibers: Skeletal and cardiac muscles are composed of muscle fibers that have a distinct banding pattern known as striations.
Learn about sarcomeres: Sarcomeres are the basic functional units of muscle fibers, responsible for muscle contraction. They are organized in a repeating pattern within the muscle fibers.
Identify the components of sarcomeres: Sarcomeres contain alternating bands of actin (thin filaments) and myosin (thick filaments), which create the striated appearance.
Explore the role of actin and myosin: During muscle contraction, actin and myosin filaments slide past each other, which is facilitated by the striated arrangement within the sarcomeres.
Differentiate between muscle types: Recognize that smooth muscle fibers do not have sarcomeres and therefore lack striations, unlike skeletal and cardiac muscles.
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