Everything Life Sciences Grade 10

The heart makes two beating sounds. One is loud and one is soft. We call this thelubb dubb sound. Thelubbsound is caused by the ...

Investigation: Investigating heart rates before, during and after strenuous exercise Aim: To investigate your heart rate before, ...

FACT Cardiac outputis the volume of blood that is pumped by the heart in one-minute. Cardiac output is equal to the stroke volum ...

Figure 8.12: Micrograph of artery. Capillaries Capillaries are little more than a single layer or endothelial cells. Capillaries ...

Figure 8.13: Schematic diagram of a vein. Figure 8.14: Diagram representing the branching of an artery into arterioles. These su ...

Figure 8.15: Valves ensure that blood flows one only way though veins. Comparison between arteries, veins and capillaries DUMMY ...

FACT The average adult heart beats: 72 times a minute 100 000 times a day 3 600 000 times a year A billion times during a lifet ...

Composition of the lymphatic system DUMMY Figure 8.17: Diagram of human lymphatic system. The lymphatic system is composed of ly ...

vessels, calledlymphatic ductswhich empty into veins in the neck. Thethoracic duct collects from the left side of the body and t ...

Lymph plays an important role inreturning plasma proteins to the bloodstream. Digested fats are absorbedand then transported fr ...

8.4 Cardiovascular diseases Cardiovascular diseases affect the heart or blood vessels (arteries, veins and capillaries). Cardiov ...

Figure 8.20: 1. Normal arteries have a wide diameter through which blood can easily flow. 2. Plaque forms on the walls of the ar ...

Figure 8.21: Heart attack: the blood clot blocks the coronary arteries and cardiac muscle dies from lack of oxygen. Hypertension ...

less than 90 millimetres of mercury (mm Hg) or diastolic pressure being less than 60 mm Hg. However, in practice, blood pressure ...

FACT The survival after heart transplant surgery is about 88% after the first year, 75% after 5 years and 56% after 10 years. FA ...

8.5 Summary Nutrients and oxygen are required by cells for cellular respiration. These are trans- ported by blood to the variou ...

Read the passage below and then answer the questions based on it. When the ventricles of the heart pump blood into the arterie ...

a) Name the components of the lymphatic system. b) Identify the: i. blood vessel numbered 3 ii. duct numbered 4 iii. structure n ...

ii. ventricular diastole iii. general diastole iv. ventricular systole d) The valve between the left ventricle and the left atri ...

a) Label parts numbered 1, 2, 7, 8.2 and 9.2 b) What type of blood (oxygenated or deoxygenated) is transported by blood vessels ...