Electrical System Of The Heart

Question 1

Myogenic muscle

Answer 1

A type of muscle tissue found in the heart that contract automatically without needing nervous stimulation the contraction is initiated by pacemakers

Question 2

Artial systole

Answer 2

One of three phases of a heartbeat
When the atria contract to push blood into the ventricles through the AV valves (ventricles are relaxed but filled with blood)

Question 3

Ventricular systole

Answer 3

One of three phases of a heartbeat
The ventricles contract to push the blood into the the arteries (pulmonary and aorta) this closes the av valves ( to prevent back flows) and causes the first “LUBB” sound

Question 4

Diastole

Answer 4

One of three phases of a heartbeat
When the heart chamber are relaxed between contractions. The semilunar valves close to prevent back flow into the ventricles. This cause the second heart sound “DUBB”

Question 5

Electrical impulse

Answer 5

The heartbeat is controlled by electrical impulses which are just signals send to simulate the muscle fibers of the heart

Question 6

Sinoatrial node

Answer 6

The heart rate is set by the sinoatrial ( SA ) node or aka pacemaker Which are a bundle of specialized muscle and nerve fibres located where the veins enter the right atrium. The sa node sends out electrical signals to the rest of the heart to stimulate the muscle fibers of the heart to contract and relax rhymically

Question 7

Anatomical pacemaker

Answer 7

Another name for the sonoatrial node aka pacemaker

Question 8

Bundle of his

Answer 8

Muscle cells specialized for electrical conduction located in the septum and receives electrical impulses from the aritroventricular node which is triggered by the Sinoatrial node and the bundle of his conducts that impulse to the ventricles

Question 9

Purkinje fibers

Answer 9

The muscles fibers the branches out from the bundle of his and conduct the impulses to the ventricles to allow them the contract together

Question 10

Electrocardiogram

Answer 10

The pace of the heart that can be measured measures the voltage in the heart and creates a map call electrocradiogram

Question 11

P wave

Answer 11

One of the three waves on a electro cardiogram

This shows the wave of the SA node being excited and the electrical activity just before the artia contract

Question 12

QRS wave

Answer 12

One of three waves seen of a electrocardiogram

Shows the electrical activity just before the ventricles contract

Question 13

T wave

Answer 13

One of the three waves seen on a electrocardiogram

Shows the ventricles resetting just before another cycle begins

Question 14

Bpm

Answer 14

Beats per minute the number of times the ventricles contract per minute

Question 15

Benefits of cardiovascular exercise

Answer 15

Increases the size of the ventricular chambers and increases the stroke volume so the heart cans work less and therefore beat slower which means the heart is working efficiently

Question 16

Stroke volume

Answer 16

The amount of blood contained in the left ventricle of the heart this depends of the how stretchy the ventricle is and how large of a can become to pump more blood when needed

Question 17

Cardiac output

Answer 17

The amount of blood pumped by the heart in one minute. The cardiac output is determined by BPM x SV = CO

Question 18

Blood pressure

Answer 18

As blood passes through the vessels in exerts pressure against the vessel walls this pressure changes depending on what phase the heart is in. The farther from heart the lower the pressure the arteries have higher pressure and the veins have lower

Question 19

Systolic pressure

Answer 19

The peak pressure in the arteries occurs at the start of the cardiac cycle when the ventricles are contracting

Question 20

Diastolic pressure

Answer 20

The resting pressure of the heart occurs while the heart is relaxed while the Atria are refilling

Question 21

Sphygmomanometer

Answer 21

Blood pressure is measures using a sphygmomanometer

Question 22

Variance of blood pressure between people and within a person

Answer 22

Blood pressure varies with lifestyle choices, health factors and demographics

Within and individual pressure also varies with exercise sleeping volume of blood and salt intake etc