Blood pressure and heart rate

Question 1

What is blood pressure measured in

Answer 1

Mmhg (milimeter of mercury)

Question 2

Systolic pressure

Answer 2

• 120mmhg (normal)
• Measures the pressure in your blood vessels when your heart beats (contract and empties blood)

Question 3

Diastolic pressure

Answer 3

• 80mmhg (nomal)
• Measures the pressure in your blood vessels when the heart rests (relaxes and fills blood)

Question 4

Controlled by 2 factors

Answer 4

1. The demand for blood in the heart (working out) the blood pressure to get higher
2. Arteries close or diameter decreases, this causes the blood to be left in the artery which will raise the blood pressure. IF the arteries open then the blood pressure will decrease.

Question 5

What is hypertension

Answer 5

• High blood pressure
• The reciptors in the aorta and carotid arteries mointor high blood pressure
• High bp - send a signal to arterioles to open
• If the blood pressure stays high for months or years it will cause the ateriole walls will weaken and rupture.

Causes: amount of physical activity, weight, diet, smoking, excericse

Question 6

Heart rate

Answer 6

Set by a natural pacemaker called a Sinoatrial (generates a electrical signal that causes the upper ateriols to contract.
The sinoatrial node is located where the vena cava enters the right atrium

Question 7

What is a heart node

Answer 7

Heart node is a specialized type of tissue that behaves as a muscle tissue and a nervous tissue.

Question 8

What happens when the nodal tissue contracts

Answer 8

it generates nerve impulses that travel throughout the heart walls
(helps power the cardiac cycle)

Question 9

Atrial contractions

Answer 9

Sinoatrial node fires, action potentials spread through the atria which contract

Question 10

Ventricular contractions

Answer 10

Atrioventricular nodes fire, sending impulses along conducting fibers; ventricles contract.

Question 11

Electrocardiogram

Answer 11

P Wave - Atrial contractions
QRS Wave - Ventricular contractions
T Wave - Signals the ventricles have recovered
Flat line - No heart contractions (inactive)