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(e) (i) the external and internal structure of the mammalian heart (ii) the dissection, examination and drawing of the external and internal structure of the mammalian heart Correct 100%$12.99
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(e) (i) the external and internal structure of the mammalian heart (ii) the dissection, examination and drawing of the external and internal structure of the mammalian heart Correct 100%
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The external and internal structure of the
Institution
The External And Internal Structure Of The
Label a diagram of the external structure of the heart - ANSWERSee picture.
Label a photograph of the external structure of the heart - ANSWERSee picture.
Label a diagram of the internal structure of the heart - ANSWERSee picture.
Label a photograph of a cross-section of the heart - ANSWER...
(e) (i) the external and internal structure of the
mammalian heart (ii) the dissection, examination and
drawing of the external and internal structure of the
mammalian heart Correct 100%
Label a diagram of the external structure of the heart - ANSWERSee picture.
Label a photograph of the external structure of the heart - ANSWERSee picture.
Label a diagram of the internal structure of the heart - ANSWERSee picture.
Label a photograph of a cross-section of the heart - ANSWERSee picture.
Explain why the heart is called a "double pump" - ANSWER- consists of two pumps, joined and
working together
- deoxygenated blood from blood flows to right side of heart, which pumps it to lungs
- oxygenated blood from lungs returns to left side of heart, which pumps it to body
Label a photograph of the internal structure of the heart - ANSWERSee picture.
Label a diagram of a cross-section of the heart - ANSWER- the pulmonary semilunar valve is above,
and smaller than the aortic semilunar valve
- the right AV (tricuspid valve) has three parts, whereas the left AV (bicuspid valve) has two
Describe the structure of the heart - ANSWERfour-chambered muscular 'bag' found in chest
, Draw a diagram showing the flow of blood from the blood through the heart (include the names of
the blood vessels adjoining the heart as well as whether the blood is oxygenated or deoxygenated
and where the blood has come form or is going to) - ANSWERSee picture.
Describe the pathway of blood as it travels from the body to the lungs - ANSWER- deoxygenated
blood enters right atrium of heart from vena cavae
- blood at relatively low pressure
- as blood flows in, slight pressure builds up
- tricuspid valve opens
- blood passes into right ventricle
- when both atrium and ventricle filled with blood, atrium contracts, forcing all blood into right
ventricle
- as right ventricle starts to contract, tricuspid valve closes
- right ventricle contracts fully and pumps blood through semilunar valves into pulmonary artery
- pulmonary artery transports it to capillary beds in lungs
Explain why the walls of the ventricles are thicker than the walls of the atria - ANSWER- more muscle
- to create more force
- needs to create higher pressure
- to push blood against greater resistance
- left ventricle pumps blood further
Describe the pathway of blood as it travels from the lungs to the body - ANSWER- at same time,
oxygenated blood from lungs enters left atrium from pulmonary vein
- as pressure in atrium builds, bicuspid valve opens between left atrium and left ventricle
- ventricle also fills with blood
- when both atrium and ventricle full, atrium contracts, forcing blood into left ventricle
- left ventricle contracts and pumps blood through semilunar valves into aorta and around body
- as ventricle contracts, tricuspid valve closes
Name the type of muscle that the heart is made from and describe its features - ANSWER- cardiac
muscle
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