muscular system

Question 1

Functions?

Answer 1

• movement : facial expressions, actions, breathing (by contracting and relaxing)
• protection : provides support to other body systems and cushions internal organs from force - applied to the body
• heat generation : helps maintain internal body temperature, generates heats to overly cool - - body when shivering
• blood circulation : aids pumping actions of the heart

Question 2

Types of muscles and functions?

Answer 2

1. skeletal muscles
   - aid movement in the body
   - maintain balance and posture
2. cardiac muscles
   - contracts to allow the heart to pump blood through circulatory system
3. smooth muscles
   - form organs like the lungs and bladder
   - allow them to facilitate bodily functions
   - digestion and nutrient collection
   - help ridden the body of toxins

Question 3

Agonist + Antagonist musles

Answer 3

1. Agonist
   - the muscle that contracts (shortens) during movement
   - biceps in a bicep curl
2. Antagonist
   - the muscles that relaxes or lengthens during movement
   - triceps in a bicep curl

Question 4

Where thing are in the body?

Answer 4

1. Medial
   - center of the body (towards the middle)
   - back and inside of the knee
2. Lateral
   - side of the body
   - latissimus dorsi
3. Anterior
   - front of the body
   - quads
4. Prosterier
   - back of the body
   - hamstrings

Question 5

Muscle contractions?

Answer 5

1. Concentric
   - muscles shorten while generating force
   - flexion
   - agonist muscles
2. Eccentric
   - muscles lengthen while tension is produced
   - extension
   - antagonist muscles
3. Isometric
   - the length of muscles remains unchanged as tension is produced
   - wall sits

Isotonic) concentric + eccentric
- tension/resistance on the muscle (the weight on your muscles stays constant)
- movement is consistent
Isokenetic) isometric
- same length (your muscles do not get longer or shorter)

Question 6

Muscle Fibres

Answer 6

1. Slow twitch
   - long periods of time
   - moderate/ low intensity
   - marathon running
   - use glucose and oxygen to generate ATP through aerobic metabolic exercies
2. Fast twitch
   - short and fast movements
   - more prone to fatigue than slow twitch
   - spinting and weightlifting
   - generate ATP through anaerobic exercies

The proportions of each type of muscle fibre present in a body is genetically predetermined.