Transport and gas transport exchange systems
In this unit, we learned about the gas exchange system and the smoking and smoking-related diseases.
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I got a 97% on the Chapter 7 test. We were requried to describe the structure of xylem vessel elements, phloem sieve tube elements and companion cells and be able to recognise these using the light microscope.
We were also asked to relate the structure of xylem vessel elements, phloem sieve tube elements and companion cells to their functions.
We were also asked to relate the structure of xylem vessel elements, phloem sieve tube elements and companion cells to their functions.
![Picture](/uploads/2/9/9/8/29985317/1401677237.png)
In the second page of Chapter 7 test, I was able to describe the pathways and explain the mechanisms by which water is transported from soil to xylem and from roots to leaves.
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In the chapter 8 test, I received a 92%. We were required to explain the relationship between the structure and function of arteries, veins and capillaries. I was able to describe the structure of red blood cells, phagocytes (macrophages and neutrophils) and lymphocytes;
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In the chapter 9 test, we were required to describe the external and internal structure of the mammalian heart
and explain the differences in the thickness of the walls of the different chambers in terms of their functions. I got a 65% because I did not know much about the cardiac cycle. However I later learned blood pressure changes during systole and diastole. Atrial Systole is a phase of the cardiac cycle during which the heart is filled with blood and the muscle in the atrial walls contract. Ventricular Systole are the walls of the ventricles contract and push the blood out of the heart into the arteries. Ventricular diastole is when the ventricles relax, and blood begins to flow into the atria again
and explain the differences in the thickness of the walls of the different chambers in terms of their functions. I got a 65% because I did not know much about the cardiac cycle. However I later learned blood pressure changes during systole and diastole. Atrial Systole is a phase of the cardiac cycle during which the heart is filled with blood and the muscle in the atrial walls contract. Ventricular Systole are the walls of the ventricles contract and push the blood out of the heart into the arteries. Ventricular diastole is when the ventricles relax, and blood begins to flow into the atria again
![Picture](/uploads/2/9/9/8/29985317/1401677950.png)
In this Chapter 10 test, I got a 94%. I was able to describe the structure of the human gas exchange system, including the microscopic structure of the walls of the trachea, bronchioles and alveoli with their associated blood vessels. We were also required to describe the functions of cartilage, cilia, goblet cells, mucous glands, smooth muscle and elastic fibres in the gas exchange system.