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Questions and Answers
Which connective tissue structure surrounds a single muscle fiber?
What is the main function of muscular tissue?
What type of muscle is characterized as involuntary and found in the walls of internal organs?
Which of the following describes complete tetanus in muscle contraction?
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Which muscle contraction type occurs when muscle twitches are fused together?
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The basic contractile unit of muscle fiber is known as what?
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The distance between two successive Z lines in muscle fiber indicates what?
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What primarily generates muscle contraction at the molecular level?
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Study Notes
Types of Tissues
- Connective tissue: supports organs and cells
- Epithelial tissue: protects the body
- Nervous tissue: controls and communicates
- Muscular tissue: responsible for body movement
Types of Muscular Tissue
- Cardiac muscle: Involuntary
- Smooth muscle: Involuntary
- Skeletal muscle: Voluntary (under conscious control)
Microstructures of Skeletal Muscle Tissue
- Epimysium: Connective tissue that covers the entire skeletal muscle
- Perimysium: Connective tissue that wraps around a bundle (fascicle) of muscle fibers
- Endomysium: Connective tissue that encloses a single muscle fiber
Sarcomere
- The distance between two successive Z lines in a muscle fiber
- Basic contractile unit of a muscle fiber
- Composed of actin and myosin filaments responsible for muscle contraction
- Filaments are closer together during muscle contraction, further apart during relaxation
Muscle Contraction
- An action potential travels along a motor nerve to its endings on muscle fibers
- Results from an interaction between actin and myosin filaments that causes their movement relative to each other
Electric Kymograph
- Used to record muscle contraction
- Components:
- Cylinder drum to record muscle events
- Tape key: voltage supplier
- Circuit key
- Stimulating electrodes
- Myo-graph board with stand
- Lever
Muscle Contraction Responses
- Simple muscle twitch: contraction generated from a single stimulus followed by relaxation
- Wave summation: muscle twitches fuse together
- Incomplete tetanus: quick cycles of contraction with a short relaxation phase for each
- Complete tetanus: the stimulus frequency is so high that the relaxation phase disappears completely
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Description
This quiz covers the different types of tissues found in the body, with a particular focus on muscular tissue. You'll learn about the structures and functions of connective, epithelial, nervous, and muscular tissues, as well as the intricate details of skeletal muscle microstructures and muscle contraction mechanisms.
