Blood Circuits and the Heart L6 Flashcards
What is the job of the cardiovascular system?
supports and keeps all the systems running
How many circuits are there in the heart?
2
How many pumps are there in the heart?
2
How many litres of blood are pumped by the heart every day?
7000Litres
What happens if the heart has stopped?
You’ll become Unconscious in 10 sec
Due to the brain being extremely reliant on the oxygen O2 and glucose that is supplied to the brain by the heart
Why do people fall unconscious?
Due to the limited blood supply to the brain
the brain has a massive reliance on the heart due to the O2 oxygen and Glucose that it supplies to the brain
without the oxygen an glucose supply a person faints
Quicker to revive = more likely to survive = decreased degradation of other tissues
What is the brain dependant on from the heart?
Oxygen and glucose
-which is transported in the blood
When has it been to long to revive someone?
4 min
Brain has been deprived of oxygen and glucose from the heart’s blood for too long
has caused Degradation of tissues
Why is it said that the faster you revive someone, the better chance they have of survival?
Because there will be less degradation of tissue
-as shorter amount of time that the tissue hasn’t been deprived of oxygen and glucose(nutrients) - especially the brain -
What are some key features about the systemic arteries?
Taking blood AWAY form the heart
Large circuit, therefore High Resistance, therefore High Pressure
Oxygenated blood
Why is the systemic circuit’s arteries of high pressure?
The systemic circuit is larger
Therefore the circuit has Larger resistance (as blood vessel length and resistance has a directly proportional positive relationship - as blood vessel length increases, so does the resistance of the vessel)
Therefore there is a larger Driving Pressure (as pressure and resistance have a positive relationship)
What are some key features of the systemic veins?
coming BACK TOO the heart
Low pressure (due to pressure gradient-lower/end of systemic circuit)
DEO blood
What are some key features of pulmonary arteries?
DEO blood - as is going too the lungs in order too get oxygenated
AWAY from the heart
Relatively smaller circuit = Medium resistance = medium pressure
What are some key features of the pulmonary veins?
Oxygenated blood - as has just left the lungs which is where oxygenation occurs
Low Pressure (due to being end of the pulmonary circuit pressure gradient)
BACK TOO the brain
Which circuit is the Left pump for?
Systemic circuit
Which circuit is the Right pump for?
Pulmonary circuit
Which capillary beds does the pulmonary circuit go to?
Lungs
site of oxygenation
Which 5x capillary beds does the systemic circuit go to?
- Limbs (musculoskeletal)
- Kidney (renal)
- Brain (nervous)
- Liver (hepatic/endocrine/digestive) repro
- Gut (digestive)
What is the functions of a capillary?
Site of Exchange
the good things (oxygen and nutrients) are picked up
the bad things (CO2 and waste products) are released
Where is the site of exchange?
Capillaries
What is a special and distinguishing feature of the Left systemic circuit?
Portal blood system
Between the 2x capillary beds of the Gut and Liver
called the Hepatic portal vein
Largest portal vein in the body
Gut uses the O2 to supply its cells
Hepatic portal vein carried DEO and nutrient rich blood
travel to liver which is the site of packing, delivering and storing nutrients
This Gut supply is part of the dependant dual blood supply to the liver, of which the liver is reliant on - from both heart and gut wall
What sort of blood flows through the Hepatic portal veins?
DEO
nutrient rich
Why does the nutrient rich DEO blood travel to the liver?
As the liver is the organ for packaging, delivering and storing nutrients
What sort of blood supply does the liver have?
DUAL blood supply
Has Hepatic ARTERIES to get direct blood supply from the heart
Has a Portal Vein to get indirect DEO nutrient rich blood supply (insufficient O2 supply from the gut alone)