Heartbeay and Blood Pressure

Question 1

Heart sounds

Answer 1

sounds comes from valves closing

Question 2

Lub

Answer 2

closing of AV valves, when ventricles contract (systole sound)

Question 3

Dub

Answer 3

snapping shut of the semilunar valves when ventricles relax (diastole sound)

Question 4

Murmur

Answer 4

caused by small amounts of blood backwashing into atrium; AV valves have not closed properly

Question 5

Blood pressure

Answer 5

• measures force of the blood in circulatory vessels of body
• blood pressure measured using a sphygmomanometer
  -120/80 mmHg (normal blood pressure)
• if BP too high, vessels can burst
• if BP too low, slow diffusion, lack of nutrition

Question 6

5 Factors influence blood pressure

Answer 6

1. Elasticity of artery (hardening of arteries = high BP. Opposite is low blood pressure)
2. Diameter of Artery (wider artery = lower pressure)
3. Viscosity of blood (thicker the blood)
4. Heart rate (heart rate increases BP increases)
5. Volume of blood (dramatic change, like loss of blood, can decrease pressure. Opposite for too much blood)

Question 7

BP sensors

Answer 7

• Baroreceptors
• Chemoreceptors
• Osmoreceptors