Blood Pressure

Question 1

Blood pressure

Answer 1

Force of blood against artery walls during ventricular contraction ( systole ) and during ventricular relaxation ( diastole )

Blood pressure = systole/Diastole, and average is 120/80, 140/90 is considered high

Measured using a sphygmomanometer

Question 2

Diastole

Answer 2

Most important because it determines the pressure on arteries when ventricles are relaxed

Question 3

Factors affecting Blood pressure

Answer 3

1. Heart rate
2. Blood vessel size: Narrower = High blood pressure

Question 4

Regulation of blood pressure

Answer 4

Low BP- difficult to transport blood to tissues
High BP- weakening and hardening of artery, ruptures blood vessels

Question 5

Hypertension

Answer 5

Known as the silent killer, caused by increased resistance to blood flow

• Blood vessels weaken and may rupture, artery’s become hard

Question 6

Causes of hypertension

Answer 6

1. Heredity
2. Diet- excess salt and high fat

Question 7

Hypotension

Answer 7

• Blood pressure is too low, caused by dehydration, severe bleeding, inflammation of internal organs, and drug toxicity

Question 8

Pressure and blood flow

Answer 8

• As area that blood flows through increases, pressure drops, highest cross sectional area in in the capillaries
• Blood travels slowest through the capillaries and fastest in the arteries
• Blood has the highest pressure in the arteries and decreases from arteries to capillaries to veins
• speed in the arteries goes arteries, veins, capillaries