CARDIOVASULAR SYSTEM
- Created by: Elle99
- Created on: 09-10-17 09:29
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- cardiovascular and respiratory systems
- cardiovascular system
- cardiac system
- Rest- heart beats 72 times a minute
- cardiac cycle lasts 0.8 seconds
- two phases
- systolic
- contract
- 0.3 secs
- empty
- contract
- diastolic
- relaxed
- 0.5 secs
- fill
- relaxed
- systolic
- cardiac output
- volume of blood ejected from the heart ventricles in 1 min
- rest-5l/min
- sub max up to 10L/min
- 20-40L/min
- Q=SV X HR
- two phases
- cardiac cycle lasts 0.8 seconds
- Rest- heart beats 72 times a minute
- conduction system
- Diastole
- both atria fill with blood
- atrial blood pressure rises above ventricular pressure
- force AV valves open, semilunar valves close
- systole
- SAN generate electrical impulse, fires through atria walls= contraction
- AVN collects impulse and delays for 0.1 second, to allow atria to finish contracting
- bundle of his(septum) splits impulse into two
- bundle branches carry impulse to bach of each ventricle
- purkyne fibres distribute impulse through vernacular walls
- contract
- semilunar valves remain closed
- aortic and pulmonary valves forced open
- blood forced
- aorta- blood tissue/muslces
- pulmonary-lungs
- blood forced
- aortic and pulmonary valves forced open
- semilunar valves remain closed
- contract
- purkyne fibres distribute impulse through vernacular walls
- bundle branches carry impulse to bach of each ventricle
- bundle of his(septum) splits impulse into two
- AVN collects impulse and delays for 0.1 second, to allow atria to finish contracting
- SAN generate electrical impulse, fires through atria walls= contraction
- systole
- force AV valves open, semilunar valves close
- atrial blood pressure rises above ventricular pressure
- both atria fill with blood
- Diastole
- heart rate
- no. of ventricular contractions in 1 min
- At rest, untrained 70-72bpm
- at rest- trained 50bpm
- sub max UT- 100-130bpm
- T- 92-120bpm
- heart more effiecent= stronger muscle= more blood around body
- maximal
- 220-age
- regulation
- ANS involuntarily regulates HR and determines firing rate of SA node
- T- 92-120bpm
- stroke volume
- volume of blood ejected from the heart
- rest UT- 70ml T-100ml
- larger heart muscle= stronger=larger filling capacity= stronger contraction=more emptied
- sub max UT-100/200ml T-160-200ml
- Trained =same!
- cardiac system
- respiratory systems
- breathing rate
- No. inspirations or expirations per min
- rest UT- 12-15B/MIN T-11-12B/MIN
- MAX- UT:40-50 b/min T:50-60 B/MIN
- changes during exercise
- increases in proportion to intensity
- plateau when o2 reach demand
- tidal volume
- volume of air inspired or expired per breath
- REST UT & T 500ml
- MAX: UT- 2.5-3L T- 2.5-3L
- initially in proportion at sub max until 3 litres
- reaches plateau as increased BR towards maximal intensity doesn't allow enough time and requires too much muslcar effort for maximal inspiration/expiration
- 2 main functions
- pulmonary ventilation
- inspiration/expiration
- gaseous exchnage
- external - alveoli
- internal- muscles
- pulmonary ventilation
- breathing rate
- cardiovascular system
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