muscles

muscles

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Question Answer
what requires muscles? movement
what are the function of muscles? provide tone , make the heart beat , produce heat and move body fluids
what are the 3 types of muscles? skeletal , cardiac and smooth
what are layers of connective tissue that seperates the skeletal muscles from other muscles called? 🙂 facia
what is the function of facia? 🙂 surrounds each muscle and sometimes forms a tendon that connects muscle to the bone
what is connective tissue that forms broad fibrous sheets that attach to bone or muscle called? 🙂 aponeuroses
what is epimysium? 🙂 connective tissue that is closest to the skeletal muscle
what is perimysium ? 🙂 connective tissue that extends inward and forms small compartments
what is endomysium? 🙂 where each muscle fiber is surrounded by a thin layer of connective tissue
what are skeletal muscle fibers? 🙂 a single cell that contracts in response to stimulation and relaxes when the stimulation is gone
what does the cytoplasm contain that helps with muscle contraction? 🙂 threadlike myofibrils
what kind of proteins do myofibrils contain?and what does it do? 🙂 myosins and actin which give the light and dark striations of a muscle
what are patterns that striations form called? and what are they ? 🙂 sarcomeres and functional unit of muscle contraction
what are the two main parts of a striation pattern and what do they do? I bands which are connected to Z linesA bands that overlap
what is a H zone? 🙂 a central region that contains only thick filaments
what is sarcoplasmic reticulum? the network of channels within the sarcoplasm that communicates with other cells
what are transverse tubules? 🙂 another set of channels that open up to the outside of the muscle
what are motor neurons? 🙂 neurons that control the skeletal muscles
what is synapse? a connection when muscle fibers are connected to motor neurons functionally
what is a neurotransmitter? 🙂 when neurons release a chemical in the synapse
what happens when a nerve impulse leaves the brain and reaches the motor neuron? 🙂 it releases neurotransmitters that stimulate muscle fibers to contract
how does a muscle contracts? 🙂 when the muscle fibers shorten and pull on its attachments
what is the neurotransmitter that stimulates muscle contractions called? 🙂 acetylcholine
what does acetylcholine bind to in the synapse and enters the muscle fibers ? receptors
what happens when impulse stops 🙂 acetylcholine is broken down by acetylcholinesterase . it prevents the impulse from continuous stimulation
what does energy sources come from? ATP

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