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Anat./Phys.

Unit 6 Muscle Quiz 12/01/23

QuestionAnswer
3 Types of Human Muscles 1) Skeletal Muscles 2) Cardiac Muscles 3) Smooth Muscles
Characteristics of Skeletal Muscles - multinuclei - voluntary -striated
Characteristics of Cardiac Muscles - involuntary - striated - 1 nuclei
Characteristics of Smooth Muscles - smmoth involuntary - 1 nuclei
Location of Skeletal Muscles skeleton
Location of Cardiac Muscles heart
Location of Smooth Muscles digestive system
Function of Skeletal Muscles movement of bones
Function of Cardiac Muscles movement of blood
Function of Smooth Muscles movement of nutrients
Nuclei Presence Significance multi nuclei vs. 1 nuclei - multinuclei = multiple nuclei ,no mitosis - 1 nuclei = only one nuclei, mitosis
Voluntary vs. Involuntary Explanation voluntary= requires conscious thought and action to complete involuntary = requires no thought or action to complete, happens on its own
Striated vs. Smooth Explanation striated= muscles with striped appearance (have dark bands) smooth = muscles with smooth appearance (no dark bands)
What is a Muscle Fiber? an elongated contractile cell that forms the muscles of the body
Functions of Muscles - excitability - condiuctivity - contractability - etensobility - elasticity
Excitability responsiveness to chemical signals, stretch, and electrical changes across the plasma membrane
Conductivity local electrical excitation sets off a wave of excitation that travels along the muscle fiber
Contractability shortens when stimulated
Extensibility capable of being stretched between contractions
Elasticity returns to its original rest length after being stretched
Endomysium :connective tissue around muscle cell
Myofibril long protein cords occupying most of sarcoplasm
Sarcoplasmic reticulum (SR) smooth ER that forms a network around each myofibril
T Tubules tubular infoldings of the sarcolemma which penetrate through the cell and emerge on the other side
Terminal cisterns dilated end-sacs of SR which cross the muscle fiber from one side to the other
Fascicle A bundle of muscle fibers within a muscle. Supplied by nerves and blood vessels and enclosed in a fibrous perimysium that separates it from neighboring fascicles.
Muscle Fiber A single muscle cell. Slender, elongated, threadlike, enclosed in a specialized plasma membrane (sarcolemma)
Slow Twitch vs. Fast Twitch slow twitch muscles are more for endurance while fast twitch muscles are for speed
Fatigue Resistance in Slow Twitch Muscles Good (do not tire easily)
Fatigue Resistance in Fast Twitch Muscles Bad (tire easily)
What us Myoglobin? a protein found in the muscle cells of animals (stores oxygen)
Myoglobin Content of Slow Twitch Muscles High
Myoglobin Content of Fast Twitch Muscles Low
Glycogen Content of Slow Twitch Muscles Low
Glycogen Content of Fast Twitch Muscles High
Mitochondria Levels of Slow Twitch Muscles High
Mitochondria Levels of Fast Twitch Muscles Low
Capillary Levels of Slow Twitch Muscles High
Capillary Levels of Fast Twitch Muscles Low
Color of Slow Twitch Muscles Red
Color of Fast Twitch Muscles White
Examples of Slow Twitch Muscles - lower leg muscles - back muscles - calfs - neck
Examples of Fast Twitch Muscles - hamstring - eyelids - biceps
Created by: emmaleighow
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