Surrounds a bundle of muscle fibers known as a fascicle
Fascia
The very outer layer (on top of epimysium)
Hypertrophy
Muscles enlarge
Atrophy
Muscles become small and weak due to disease
Cellular Respiration
Glucose + Oxygen —> Carbon dioxide + water + ATP + heat energy
Muscle cells produce energy to contract by an organelle called the mitochondria which runs a chemical process called cellular respiration
Sliding Filament Theory
1. Once a nerve signal reaches a muscle, the actin filaments slide toward one another, causing the muscle to contract
2. In order to contract you need ATP and calcium
3. Protein is in the actin and myosin
A few hours after a person or animal dies, the joints stiffen and become locked in place
Antagonistic pairs
They need to do opposite jobs in order for your body to move. One muscle contracts so your body moves then the other muscle in the pair contracts to move the body part back into its original position
Slow Twitch Muscles
They contract slowly, but have more endurance
Have more mitochondria in muscle cells thus more efficient at usingO2
Fast Twitch Muscles
Fatigue easily but provide great strength for rapid short movements
