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B2: Quiz 9 – Answers
B2: Quiz 9 – Answers
1)
a)
1 – right atrium
2 – left atrium
3 – left ventricle
4 – right ventricle
b) Atria
2)
a) One of the circulatory systems goes from the heart to the lungs and back to the heart (pulmonary system)
The other circulatory system goes from the heart to the rest of the body and back to the heart (the systemic system)
b) The right side
c) The left side
3)
a – vena cava
b – pulmonary artery
c – aorta
d – pulmonary vein
4)
a) 4 valves
b) The valves prevent backflow/ ensures that blood flows in the correct direction through the heart
c) The walls of the heart contract which causes blood to move onto either the next chamber in the heart or out of the heart
5) Blood coming out of the left ventricle travels to the rest of the body and blood coming out of the right ventricle travels to the lungs. There is a greater distance between the heart and the rest of the body, compared to the heart and the lung. This means that a greater blood pressure/ force is required to pump blood around the rest of the body. The heart provides this greater blood pressure/ force by having a thicker wall containing more heart muscle – this is why the wall for the left ventricle is thicker than the wall for the right ventricle
6)
a) The coronary arteries
b) Aorta (the coronary arteries branch off of the aorta)
7)
a) There are a group of cells located in the wall of the right atrium that act as a pacemaker (they control heart rate). These cells send out small electrical impulses to the muscle cells in the heart, which causes the muscle cells to contract
b) Doctors can insert an artificial pacemaker, which is a small battery-operated electrical device that sits under the skin. The device has wires that go to the heart. The pacemaker sends electrical impulses along these wires to produce normal contractions in the heart
a)
1 – right atrium
2 – left atrium
3 – left ventricle
4 – right ventricle
b) Atria
2)
a) One of the circulatory systems goes from the heart to the lungs and back to the heart (pulmonary system)
The other circulatory system goes from the heart to the rest of the body and back to the heart (the systemic system)
b) The right side
c) The left side
3)
a – vena cava
b – pulmonary artery
c – aorta
d – pulmonary vein
4)
a) 4 valves
b) The valves prevent backflow/ ensures that blood flows in the correct direction through the heart
c) The walls of the heart contract which causes blood to move onto either the next chamber in the heart or out of the heart
5) Blood coming out of the left ventricle travels to the rest of the body and blood coming out of the right ventricle travels to the lungs. There is a greater distance between the heart and the rest of the body, compared to the heart and the lung. This means that a greater blood pressure/ force is required to pump blood around the rest of the body. The heart provides this greater blood pressure/ force by having a thicker wall containing more heart muscle – this is why the wall for the left ventricle is thicker than the wall for the right ventricle
6)
a) The coronary arteries
b) Aorta (the coronary arteries branch off of the aorta)
7)
a) There are a group of cells located in the wall of the right atrium that act as a pacemaker (they control heart rate). These cells send out small electrical impulses to the muscle cells in the heart, which causes the muscle cells to contract
b) Doctors can insert an artificial pacemaker, which is a small battery-operated electrical device that sits under the skin. The device has wires that go to the heart. The pacemaker sends electrical impulses along these wires to produce normal contractions in the heart
Questions
1) The diagram below is of a human heart.
1) The diagram below is of a human heart.
a) Give the names of the 4 chambers that are labelled on the above heart.
b) When blood enters the heart, does it enter into an atria or a ventricle?
2)
a) Mammals have a double circulatory system. Where do these two circulatory systems go?
b) Which side of the heart pumps blood to the lungs; the left side or the right side?
c) Which side of the heart pumps blood to the rest of the body; the left side or the right side?
3) The diagram below shows a human heart.
b) When blood enters the heart, does it enter into an atria or a ventricle?
2)
a) Mammals have a double circulatory system. Where do these two circulatory systems go?
b) Which side of the heart pumps blood to the lungs; the left side or the right side?
c) Which side of the heart pumps blood to the rest of the body; the left side or the right side?
3) The diagram below shows a human heart.
Give the names of the 4 blood vessels that are labelled on the above heart.
4)
a) How many valves are there in a human heart?
b) What role do valves play in the heart?
c) What causes blood to move through the heart?
5) Why is the wall around the left ventricle thicker than the wall around the right ventricle?
6)
a) How is blood supplied to the cardiac muscles in the walls of the heart?
b) Which blood vessel does your answer to part a come from?
7)
a) Explain how your heart rate is controlled and say where the cells that control heart rate are found.
b) Individuals can have conditions that cause their heart to beat too fast, too slow or in an irregular rhythm. What can doctors do to fix this problem? Explain how the solution solves the problem.
4)
a) How many valves are there in a human heart?
b) What role do valves play in the heart?
c) What causes blood to move through the heart?
5) Why is the wall around the left ventricle thicker than the wall around the right ventricle?
6)
a) How is blood supplied to the cardiac muscles in the walls of the heart?
b) Which blood vessel does your answer to part a come from?
7)
a) Explain how your heart rate is controlled and say where the cells that control heart rate are found.
b) Individuals can have conditions that cause their heart to beat too fast, too slow or in an irregular rhythm. What can doctors do to fix this problem? Explain how the solution solves the problem.