Animal Transport 1 (Circulatory Systems and the Heart) Flashcards

1
Q

Define an open transport system

A

Blood is not enclosed in vessels but bathes the cells directly (eg an insect)

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2
Q

Define a closed transport system

A

Blood is enclosed in blood vessels and is never in direct contact with cells

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3
Q

Define a single transport system

A

Blood passes through the heart once for each circuit of the body (eg a fish)

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4
Q

Define a double transport system

A

Blood passes through the heart twice for each circuit of the body (eg a human)

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5
Q

What is the disadvantage of a single circulatory system compared to a double?

A

Pressure is lost when blood passes through the capillaries of the gills. There is a lower pressure then going to the rest of the body

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6
Q

Describe the circulatory system of an earthworm

A

A closed circulatory system with haemoglobin

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7
Q

Describe the circulatory system of an insect

A

An open circulatory system with a fluid-filled body cavity (haemocoel). No oxygen is transported in the blood, this is instead done by the tracheal system

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8
Q

Which vein returns blood to the heart from the body?

A

The vena cava

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9
Q

Which vein returns blood to the heart from the lungs?

A

The pulmonary vein

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10
Q

Which artery takes blood from the heart to the body?

A

The aorta

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11
Q

Which artery takes blood from the heart to the lungs?

A

The pulmonary artery

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12
Q

Name the wall down the middle of the heart

A

The septum

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13
Q

Name the valves between the atria and the ventricles

A

Atrioventricular/bicuspid and tricuspid

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14
Q

Name the valves between the ventricles and the arteries

A

Semilunar/pulmonary and aortic

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15
Q

What does it mean that the heart muscle is myogenic?

A

It initiates its own contractions

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16
Q

Name the heart’s pacemaker

A

Sino Atrial Node

17
Q

What is the purpose of the AVN?

A

The atrioventricular node delays the wave of excitation, allowing the atria to finish contracting and the ventricles to fully fill before the ventricles contract

18
Q

What stops the electrical signal in the heart going straight from atria to ventricles?

A

A layer of non conductive connective tissue

19
Q

Name the tissue that conducts electricity in the septum and ventricles of the heart

A

Bundle of His in septum/ purkyne/purkinje fibres

20
Q

What does ECG stand for?

A

Electrocardiogram

21
Q

Which blood vessels supply the heart muscle itself with oxygen and glucose?

A

Coronary arteries

22
Q

What does the P wave of an ECG correspond to?

A

Depolarisation of the atria during atrial systole

23
Q

What does the QRS complex of an ECG correspond to?

A

Spread of depolarisation through the ventricles resulting in ventricular systole

24
Q

What does the T wave of an ECG correspond to?

A

The repolarisation of the ventricles during ventricular diastole

25
Q

When do the atrioventricular valves open?

A

When the pressure in the atria is higher than in the ventricles (during ventricular diastole)

26
Q

When do the atrioventricular valves close?

A

When the pressure in the ventricles is higher than the atria (during ventricular systole)

27
Q

When do the semilunar valves open?

A

When the pressure in the ventricles is higher than in the arteries (during ventricular systole)

28
Q

When do the semilunar valves close?

A

When the pressure in the arteries is higher than in the ventricles (during ventricular diastole)

29
Q

Why does pressure in the aorta never drop to zero?

A

Elastic recoil of the aorta, which decreases the volume and increases the pressure. Also the fact the semi lunar valve closes, preventing backflow.

30
Q

Why does the left ventricle have a thicker wall than the right?

A

It needs to pump blood at a higher pressure for the systemic circulation