Blood Vessels Flashcards
What factors influence blood pressure?
Cardiac output (HR X SV)
Blood volume
Total Peripheral resistance.
What is total peripheral resistance
The collective diameters of blood vessels
What in the brain regulates blood pressure ?
The medulla oblongata
What are the center in the MO that controls the heart called?
The cardiac control center (CCC)
What are the parts of the CCC?
Cardiac acceleratory center - Increase HR/BP
Cardiac Inhibitory center - Decrease HR?BP
Vasomotor center - vasoconstriction
How does the SNS regulate blood pressure?
It increases the response of the CAC, increasing blood pressure, SA node firing rate, HR, and Ventricular contractibility. Increase vasomotor center.
How does the PSNS affect blood pressure?
Increases CIC, decreases SA node firing, HR, BP, CAC, and Vasomotor.
What are the two receptors of blood pressure?
Baroreceptors and Chemoreceptors.
How do baroreceptors work?
They sense pressure and if they are stretched, it indicates a higher BP. They will also fire and a faster fire rate means a higher BP.
How do chemoreceptors work?
Located in RT. Subclavian artery, aortic arch, and external carotid.
Sense changes in CO2 and PH
An increase in H ions will increase vasoconstriction, BP
What are the long term responses to blood pressure in terms of being reducing (its low)?
Renin-angiotensin-aldosterone (RAA)
Antidiuretic hormone
Erythropoietin.
What is anti diuretic hormone?
Stimulated by aldosterone
increases blood osmolarity (increased solute concentration)
Increases water retention at kidney/Blood
Decrease blood volume/pressure
What is erythropoietin do?
Stimulated by reduced oxygen delivery to the kidney
Stimulates RBC production
Increase blood volume
How does ANP respond to elevated BP?
Reduce thirst, inhibits means the increase BP, SNS activity and aldosterone release and ADH.
Sodium is related at kidney to draw water out.
What process elevated blood pressure on a long term?
Atrial Natriuretic peptide
