2448385
Descripción
Test por briella-awele, actualizado hace más de 1 año
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Creado por briella-awele
hace más de 9 años
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Pregunta 1
Pregunta
What is the main purpose of the heart and the circulatory system?
Respuesta
-
Primarily used for exchange of oxygen and carbon dioxide between air we breathe and blood
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To move substances around the body
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To collect carbon dioxide waste materials and fluids for return to the veins.
Pregunta 2
Pregunta
Diffusion is the movement of ions or molecules across a cell membrane in the direction that is, from an area of lower concentration to one of higher concentration.
Respuesta
- True
- False
Pregunta 3
Pregunta
When it comes to movement of substances around the body, what is the problem for humans and mammals?
Respuesta
-
They are smaller and so cannot have enough space for movement to take place
-
They only have one cell that is used to function their entire being
-
They have problems functioning properly
-
They are too large for diffusion to move substances around their bodies quickly enough
Pregunta 4
Pregunta
Multicellular organisms deal with their difficulty in moving substances around the body because they usually have blood to carry vital substances around their bodies and a heart to pump it around
Respuesta
- True
- False
Pregunta 5
Pregunta
Difference between open and closed circulatory systems?
Respuesta
-
In closed systems: Simple heart pumps blood into the cavities but returns the blood back to the heart, and then to the body In open systems: The heart pumps blood around the body and substances diffuse between the organs and cells
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In closed systems: blood is enclosed within tubes. the blood is forced along fairly narrow channels instead of flowing into large cavities In open systems: simple heart pumps blood out into cavities surrounding the animal’s organs. Substances can diffuse between the blood and cells. When the heart muscle relaxes, blood is drawn from the cavity back into the heart, through small valved openings along its length.
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In closed systems: The blood flows in the body organs which uses enclosed tubes to send it back to the heart In open systems: The heart pumps the blood in cavaties and then blood is drawn from cavity back into the heart
Pregunta 6
Pregunta
Closed circulatory systems are much slower because they are larger and need less pressure to move substances
Respuesta
- True
- False
Pregunta 7
Pregunta
In a human the blood flows through the heart once for each complete circuit of the body.
Respuesta
- True
- False
Pregunta 8
Pregunta
Why do mammals and birds have higher metabolic rates?
Respuesta
-
The oxygen and food substances required for metabolic processes can be delivered more rapidly to cells in mammals and birds
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There are extremely large numbers of capillaries which ensure oxygen is exchanged quicker
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Longer time for the blood to circulate around their body
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Organs diffuse substances quicker to the body , then the heart accepts quicker and then pump blood around.
Pregunta 9
Pregunta
That is a diagram of a human circulatory system...
Respuesta
- True
- False
Pregunta 10
Pregunta
The transport medium in animals is usually blood
Respuesta
- True
- False
Pregunta 11
Pregunta
The blood leaves the heart under pressure and flows along venules to capillaries.
Respuesta
- True
- False
Pregunta 12
Pregunta
What is the function of a valve?
Respuesta
-
To prevent the blood from flowing in the arteries
-
To prevent the entrance of waste in the blood
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To ensure that blood flows only in one direction
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To ensure that the heomoglobin in the blood has enough oxygen
Pregunta 13
Pregunta
What plays a vital role in regulation of body temperature, transferring energy around the body.
Respuesta
-
Water
-
Blood
-
Lymph
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Saliva
-
Urine
Pregunta 14
Pregunta
The reason water has an unevenly distributed electrical charge is because it is heavily ionised
Respuesta
- True
- False
Pregunta 15
Pregunta
Many biochemical reactions occur in the cytoplasm of cells due to the solvent properties of water
Respuesta
- True
- False
Pregunta 16
Pregunta
Polar molecules are said to be...
Respuesta
-
Hydrophobic
-
Hydrophilic
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None of the above
Pregunta 17
Pregunta
Why is it difficult for lipids to be transported by transport mediums in the body?
Respuesta
-
Lipids have no ionic properties
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Lipids are hydrophobic
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Lipids are very soluble
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Lipids have strong covalent bonds
Pregunta 18
Pregunta
Lipids can be transported around the body by binding with amino acids to form lipoproteins which can then be transported by transport mediums
Respuesta
- True
- False
Pregunta 19
Pregunta
The specifi c heat capacity of water, the amount of energy in joules required to raise the temperature of 1 cm3 (1 g) of water by 10 ºC, is very high
Respuesta
- True
- False
Pregunta 20
Pregunta
In the diagram, which labeled structures are atrioventricular valves?
Respuesta
-
A
-
B
-
C
-
D
-
E
Pregunta 21
Pregunta
What makes arteries and vessels strong and durable?
Respuesta
-
Thick walls
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Muscle
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Collagen
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Fibres
Pregunta 22
Pregunta
During diastole, blood is forced into arteries and their elastic walls stretch to accommodate the blood.
Respuesta
- True
- False
Pregunta 23
Pregunta
What occurs when you feel a pulse?
Respuesta
-
An artery has just passed over a bone close to the skin.
-
A valve has just closed
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The vein that has passed over a bone close to the skin has just returned blood back to the heart
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None of the above
Pregunta 24
Pregunta
By the time the blood reaches the smaller arteries and capillaries there is a steady
flow of blood.
Respuesta
- True
- False
Pregunta 25
Respuesta
- True
- False
Pregunta 26
Pregunta
The heart muscle is supplied with blood through two vessels called the
Respuesta
-
Circumflex artery
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Marginal artery
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Mitral artery
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Cardiac vein
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Coronary artery
Pregunta 27
Pregunta
One complete sequence of filling and pumping blood is called a
Respuesta
-
Pulmonary cycle
-
Heartbeat
-
Cardiac cycle
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Pulse
Pregunta 28
Pregunta
The cardiac cycle can be simplified into four phases
Respuesta
- True
- False
Pregunta 29
Pregunta
Blood under low pressure flows into the left and right atria from the
Respuesta
-
Pulmonary veins and vena cava
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Inferior vena cava and Pulmonary artery
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Pulmonary vein and right ventricle
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Just the vena cava
Pregunta 30
Pregunta
What phase of the cardiac cycle when the atrioventricular valves are forced open, when the atria fills up with blood
Respuesta
-
Ventricular systole
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Ventricular diastole
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Atrial systole
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None of the above
Pregunta 31
Pregunta
What is the correct order of the phases in the cardiac cycle
Respuesta
-
Atrial systole, Diastole, Ventricular systole
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Ventricular systole, Atrial systole, Ventricular Diastole, Atrial Diastole
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Atrial systole, Atrial diastole, Ventricular systole, Ventricular diastole
-
Atrial systole, Ventricular systole, Diastole
Pregunta 32
Pregunta
Closing of the bicuspid valves and then the tricuspid valves creates the
characteristic sounds of the heart.
Respuesta
- True
- False
Pregunta 33
Pregunta
Thrombosis is the the disease process that leads to coronary heart disease and strokes
Respuesta
- True
- False
Pregunta 34
Pregunta
What are some of the causes of when the arteries have been narrowed?
Respuesta
-
Athletes foot and Heart attack
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Gangrene and Tissue death
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Swelling and skin redness
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Chest pain and Scars
Pregunta 35
Pregunta
A deposit of cholesterol that builds up is called an atheroma
Respuesta
- True
- False
Pregunta 36
Respuesta
-
A diseased coronary artery
-
A healthy coronary artery
-
A platelet
-
A diseased pulmonary vein
Pregunta 37
Pregunta
Platelets are a type of blood cell with a nuclues
Respuesta
- True
- False
Pregunta 38
Pregunta
What happens to platelets when they reach a damaged cell?
Respuesta
-
They differentiate to form more platelets
-
The shrink and stick to each other to form a better a shape
-
They change shape
-
Release substances that activate to make more platelets
-
They grow longer in order to be able to reach and stick to the damaged cell
Pregunta 39
Pregunta
Platets change their cell surfaces causing them to stick to the exposed collagen in the wall
Respuesta
- True
- False
Pregunta 40
Pregunta
What causes a complex series of chemical changes in the blood?
Respuesta
-
The direct contact of blood with collagen
-
Exercise
-
Eating
-
All of the above
-
None of the above
Pregunta 41
Pregunta
Prothrombin is insoluble
Respuesta
- True
- False
Pregunta 42
Pregunta
The first stage of clotting is that thrombrin is converted to prothrombin
Respuesta
- True
- False
Pregunta 43
Pregunta
Fibronogen is an enzyme that catalyses the conversion of another soluble plasma protein
Respuesta
- True
- False
Pregunta 44
Pregunta
The reason fibrin can form a tangled mesh with its strands is because of its insolubility
Respuesta
- True
- False
Pregunta 45
Pregunta
Arteries get atherosclerosis because of the fast flowing blood under preassure causing damage to the walls
Respuesta
- True
- False
Pregunta 46
Pregunta
Veins and Arteries get atherosclerosis
Respuesta
- True
- False
Pregunta 47
Pregunta
Thromboplastin is released from fibronogen in order to make it easier to convert to fibrin
Respuesta
- True
- False
Pregunta 48
Pregunta
In the False-colour scanning electron micrograph, the green coloured substance is the...
Respuesta
-
Fibrins
-
Platelets
-
Cells
-
Fibronogen
Pregunta 49
Pregunta
In the False-colour scanning electron micrograph, the yellow coloured substance is the...
Respuesta
-
Fibrins
-
Platelets
-
Fiibronogens
-
Cells
Pregunta 50
Pregunta
Angina is chest burn caused by narrowing of the coronary arteries
Respuesta
- True
- False
Pregunta 51
Pregunta
Why do we feel pain when we have coronary heart disease?
Respuesta
-
Chemical changes when the muscle respires anaerobically
-
The burning of the heart muscle after damage to the cells due to high blood pressure in the arteries
-
Lack of blood supply to the brain
-
Dead cells occupying areas of heart tissue
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