.    Copy and complete the sentences using these words ( some may be used twice) Oxygen,   body tissues.   ,   left lungs,     carbon dioxide,      veins.   Deoxygenated ,    right. Oxygen*

The right side of the mammalian heart pumps blood to the   .   Here it absorbs and is now called   blood.

The gas   is removed from the blood in the lungs.   The blood returns to the   side of the heart and from here it is pumped to the where it gives up its   and is now called blood.    It passes back to the   side of the heart in     

                                                                                                                                                                    [8marks]

2.   Explain what is meant by the term single Circulation and double circulation.                   [4marks]

3. Write at least 4 key points / statements about the mammalian heart.                                  [8marks]

1. The right side of the mammalian heart pumps blood to the LUNGS.   Here it absorbs OXYGEN and is now called OXYGENATED blood.

The gas, CARBON DIOXIDE is removed from the blood in the lungs. The blood returns to the LEFT side of the heart and from here it is pumped to the BODY TISSUES where it gives up its OXYGEN and is now called DEOXYGENATED blood. It passes back to the LEFT side of the heart in VEINS    

2. Single Circulation -> The blood only passes through the heart once

   Double Circulation -> The blood  passes through the heart twice

3. Made of myocardium (thick muscle), four-chambered separated by valves, cardiac muscle is oxygenated via cornary ateries + veins, transports blood carrying oxygen + nutrients to the body's tissues

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.