Overview Of CVS Flashcards
Enumerate overall functions of CVS
Homeostasis
Temperature regulation
Communication function
Mention the two conditions for CVS to control tissue fluid composition
- Pumping adequate blood flow through tissue capillaries by heart
- Conditioning chemical composition of arterial blood by specific organs that add nutrients, oxygen, hormones etc.
Describe temp regulation by CVS
By chaning blood flow to skin & mixing/diluting temperature changes
Describe comm function of CVS
Hormones are transported from their endocrine glands to target organ by blood stream.
Mention & describe function of heart
Pumping function
Compression pump during systole
Suction pump during diastole
Describe function of aorta & big arteries
Windkessel function, store some of the blood ejected by the heart during systole & deliver it to organs fownstream by passive recoil during diastole.
Mention function of muscular arteries
Distributing function
GR: Capillaries are the most imp component of CVS
They are the site of exchange with the fluid bathing the tissue cells.
Describe function of veins
Capacitance, by containing most of the circulating blood volume acts as revervoirs of CVS.
Mention aim of systemic & pulmonary circulations
S: caapillary exchange in all tissues
P: dry exchange to arterialize venous blood in lungs
Mention rules of blood flow in CVS
The fluid blood is continually moving with unidirectional flow in a closed circuit.
Describe blood flow in ventricles, aorta, capillaries & veins.
V: intermittent, flow during systole, stopped during diastole.
A: pulsatile with high p at systole, low p at diastole.
C: still pulsatile but small difference
V: steady flow
Importance of pulsatility in capillaries
Help homeostasis by mixing up & stirring tissue fluid.
Mention structures arranged in series in CVS
Pulmonary & systemic circulations
Components of each circuit
Mention site of parallel arrangement in CVS
With both systemic and pulmonary ciculations, vessels supplying different tissues arranged in parallel
Mention advantages of parallel arrangement ofblood vessels
Peoper homeostasis, flow through any of systemic organs can be cotrolled, lower peripheral resistance.
What happens if organ blood supply was arranged in series?
The second & third tissue will recieve blood after passing in other tissues losing some of its O2 and glucose and having waste products.
Pressure in left ventricle is …., while in right atrium it is ……
120 mmHg
Almost zero
The pressure dissipates, overcoming …..
Resistance
The largest drop in pressure is in ….., from …. to ….. .
Arterioles
93 mmHg to 32 mmHg
Pressure drop in capillaries is from …. to …..
32 mmHg to 10 mmHg
In venous system pressure drop is from …. to ….
10 mmHg, zero
High pressure of arterial side is suitable for …. function, while low pressure of venous side is suitable for….function
Filtration
Reabsorption
The pressue at the dividing point between arterial and venous side is called …..
Its value is ….
Functional capillary pressure
17 mmHg
Mentiom components of high pressure sysyem
Left ventricle during systole
Aorta, big arteries, distributing arteries
Arterioles
Arterial side of capillaries
Mention compnents of low pressure system
Venous side of capillaries Venules, small veina, large veins and venae cavae Atria Pulmonary ciculation Ventriclea at diastole
Velocity is directly proportional to ….. & inversely proportional to …..
Blood flow
Total cross-sectional
Describe the significance of compliance
Relates how volume changea in response to chamge in pressure
