Muscular System. Types of Muscle ● Skeletal – ● Smooth – ● Cardiac - The word “striated” means striped. Skeletal muscle appears striped under a microscope.

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Presentation transcript:

Muscular System

Types of Muscle ● Skeletal – ● Smooth – ● Cardiac - The word “striated” means striped. Skeletal muscle appears striped under a microscope.

Muscles and Muscle Fiber Structure Muscles are composed of many fibers that are arranged in _______________________ Individual muscles are separated by _______, which also forms tendons Video on plantar fasciitis.

EPIMYSIUM = PERIMYSIUM = ENDOMYSIUM = This model of the muscles uses straws to represent fibers. Green = endomysium Yellow = perimysium Blue = epimysium

Muscle Layers

Muscles / Cells Sarcolemma = Sarcoplasm Myofibrils =

Myofibrils are made of ACTIN = MYOSIN =

Myofilaments ACTIN (thin) and MYOSIN (thick) -- form dark and light bands  A band = dArk thick (myosin)  I band = lIght thIn (actin)

It is important to remember the hierarchy

How Muscles Work with the Nervous System NEUROMUSCULAR JUNCTION -

1. Neuron 2. Sarcolemma (or motor end plate) 3. Vesicle 4. Synapse 5. Mitochondria Motor Unit or Neuromuscular Junction

The neurotransmitter that crosses the gap is ACETYLCHOLINE. This is what activates the muscle. Acetylcholine is stored in vesicles

SLIDING FILAMENT THEORY (MODEL) The theory of how muscle contracts is the sliding filament theory. The contraction of a muscle occurs as the thin filament slide past the thick filaments. The sliding filament theory involves five different molecules and calcium ions. The five molecules are: myosin actin tropomyosin troponin ATP

Sliding Filament Handout

Energy Source -ATP is produced by _________________________ __________________________________________ -Creatine phosphate increases regeneration of ATP * Only 25% of energy produced during cellular respiration is used in metabolic processes - the rest is in the form of HEAT. -maintains body temperature.

Why might products like pro-creatine claim to increase energy? ATP = adenosine triphosphate ADP = adenosine diphosphate

Other Terms ● 1. Threshold Stimulus ● 2. All-or-None Response ● 3. Motor Unit ● 5. Recruitment ● 6. Muscle Tone ● 7. Muscular Hypertrophy ● 8. Muscular Atrophy ● 9. Muscle Fatigue ● 10. Muscle Cramp ● 11. Oxygen Debt

1. Threshold Stimulus 2. All-or-None Response

3. Motor Unit 4. Recruitment 5. Muscle Tone

6. Hypertrophy - 7. Atrophy

8. Muscle Fatigue - 9. Muscle Cramp Oxygen Debt -

11. Origin and Insertion Origin = Insertion = The biceps brachii has two origins (or two heads).

What is rigor mortis? A few hours after a person or animal dies, the joints of the body stiffen and become locked in place. This stiffening is called rigor mortis. Depending on temperature and other conditions, rigor mortis lasts approximately 72 hours. The phenomenon is caused by the skeletal muscles partially contracting. The muscles are unable to relax, so the joints become fixed in place.

What is tetanus? Tetanus causes cholinosterase to not break down the acetylcholine in the synapse. This results in a person's muscles contracting and not relaxing. A tetanus shot must be administered shortly after exposure to the bacteria. Once you develop tetanus, there is no cure.