Muscular System

What’s this?

What’s this?Canker sore!

Shallow ulcers in the mouth

What causes them?Stress or tissue traumaCitrus can trigger or worsen symptomsB12, zinc, iron deficiencyDifferent than cold sores

Review• Attaches to bone/face skin• Long, cylindrical, striated• Voluntary

Skeletal

• Walls of the heart• Involuntary• Rhythmic contraction

Cardiac

• Walls of hollow organs• Involuntary, hormones/nervous

system• Slow contraction

Smooth

Review1. Producing Movement2. Maintain posture and position3. Stabilize joints4. Generate heat

Producing MovementObvious here, muscles create movementMuscle create the ability to walk, swim, runCirculate blood, maintain blood pressureForce food through intestines/stomach

Maintain Posture/Position

Everybody Stand up!Remove the shoe of your dominant footBalance on your dominant foot for 1 minuteNotice the slight twitches of your foot to maintain balance

Stabilizing JointsMuscles/tendons cross the joints

EX: Shoulder/Hip

Extremely important for unstable joints

Generate HeatIn any energy system, there are by productWhen you exercise, what happens to your body?

Cars- ExhaustExercise-heat

Skeletal MuscleAttaches to bone via tendons

Attaches to skin in the face

Voluntary from nervous systemStriated muscle (obvious stripes)Contracts quickly, but also fatigues quickly

Type I v. Type IIType I – Slow twitchType II – Fast twitch

Type II(a)Type II(b)

Type IOxygen efficientNecessary for extended muscle contraction (over time)Longer time before fatige

Type IIAnaerobicSpeed and strengthFatigue quicklyType II(a)

Combination of type I and type II

Type II(b)Classic fast twitchRapid firing

Muscle Tissue AnatomyMuscle FiberEndomysiumFasciclePerimysiumEpimysiumTendon

Structure of Muscle

Activity!Demonstration using food!Each table will get 2-3 twizzlers. Using saran wrap, post it notes and the twizzlers, create a diagram that shows the structure of muscle

HomeworkDefine terms from the reading:

Striated MuscleVoluntary MuscleFascicleEndomysiumPerimysiumEpimysium

Possible quiz next class!