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From Flashcardlet > Human Bio Unit 1 - Circulation > Flashcards

Human Bio Unit 1 - Circulation Flashcards

0
Q

What is the line across the surface of the heart that separates the ventricles called?

A

The interventional sulcus

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1
Q

Why is the left side of the muscular heart wall thicker?

A

Pumps the blood to the body so has to do more

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2
Q

Double circulatory

A

Blood goes through the heart twice on its journey around the body

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3
Q

What system of circulation does most mammals have?

A

Double ciculatory

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4
Q

What system of circulation is the most effective?

A

Double circulatory

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5
Q

Pulmonary

A

Picks up oxygen

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6
Q

Sytemic

A

Delivers oxygen

Under high pressure

Rapid pumping

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7
Q

Where is oxygen added to the lungs and carbon dioxide removed?

A

The lungs

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8
Q

Where is carbon dioxide added to the blood and oxygen transferred to the muscles?

A

The capillaries

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9
Q

Name the four stages in the cardiac system (in order starting from wherever)

A

Atrial systole

Isovolumic ventricular contraction

Ventricular systole

Ventricular diastole

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10
Q

Systole

A

Contraction

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11
Q

Diastole

A

Relaxing

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12
Q

Ventricular systole

A

Atria relax and ventricles fill with blood

Ventricles contract, pressure increases, forces AV valves to close

Force blood out through pulmonary artery and aorta

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13
Q

Ventricular diastole

A

Ventricles relax, pressure drops

Accumulated blood flows from the atrium into the ventricle

Blood returns to the atria through the pulmonary vein and vena cava

This causes the pressure to increase and forces AV valves open

Pressure is lower in the aorta then the pulmonary valve so semilunar valves close

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14
Q

Atrial systole

A

Atrium contracts and tops off the ventricle with blood

Is complete before the ventricle begins to contract

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15
Q

Isovolumic ventricular contaction

A

Valves close to stop blood flowing back

16
Q

How the circulatory system responds to the greater demands of exercise

A

Accelerator nerve releases chemical neurotransmitter at the SAN to increase rate and force of contraction of the heart

Adrenalin is released from the adrenal gland to stimulate the heart

17
Q

How does the heart slow itself down after exercise?

A

Decelerator nerve releases a chemical called acetylcholine to SAN

18
Q

How is blood moved out of the atria?

A

It squeezes blood from the top to the bottom of it

19
Q

How is blood moved out of the ventricles?

A

Squeezed out from the bottom to the top

20
Q

How would you describe blood being forced out of the atria and ventricles?

A

Like squeezing toothpaste out of the role to try and get the last bits

21
Q

Parts of the vena cava

A

Superior vena cave

Inferior vena cava

22
Q

Superior vena cava

A

Pumps deoxygenated blood from the upper body

23
Q

Inferior vena cava

A

Pumps deoxygenated blood from the lower body

24
Q

How would you label left and right on the heart

A

With right as left and vise versa

As if cutting someone open and it was their right/left

25
Q

Tricuspid valve

A

Valve between the right atrium and right ventricle

26
Q

Pulmonary artery

A

Carries deoxygenated blood from the right ventricle to the lungs

27
Q

Aorta

A

Carries oxygenated blood from the left ventricle to the body

28
Q

Pulmonary veins

A

Carries oxygenated blood from the lungs to the heart

29
Q

Pulmonic valve

A

Valve to stop blood flowing freely from right ventricle into the pulmonary artery

30
Q

Aortic valve

A

Valve to stop blood flowing freely from left ventricle into the aorta

31
Q

Mitral/bicupsid valve

A

Valve between the left atrium and ventricle

32
Q

What is the division between the two halves of the heart called?

A

Septum

From Flashcardlet (72 decks)

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