Uploaded by Salina Shrestha

year 7 science heart and kidney

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• LESSON GOALS:
• TO LEARN ABOUT HEART, ITS PARTS AND THE FUNCTIONS
• TO LEARN ABOUT KIDNEY, ITS PARTS AND THE FUNCTIONS
• Learn the lab safety rules and follow them
HEART
•INTRODUCTION
Heart is a muscular organ which pumps blood through the blood vessels
Size: size of one’s fist
Position: center of the chest, usually pointing slightly left
beats about 100,000 times per day
Functions
• Pumps oxygenated blood all over the body
• Supply nutrients and oxygen in the body
• Elimination of Carbon dioxide and waste
Parts of heart
Chambers of heart
• Four chambers: two upper chambers are atrium (singular: atrium)
and the lower two are known as (singular: ventricle).
• Muscular walls, septa or septum, divide the heart into two side
Valves of heart
• 3 types:
Tricuspid: between the right atrium and ventricle.
Mitral: between left atrium and ventricle
Pulmonary: between right ventricle and pulmonary artery
Aortic: between left ventricle and aorta
Function: to prevent the backflow of the blood
Major Blood vessels
• Pulmonary arteries and veins
• Aorta: distributes blood to the body
• Superior venacava: brings blood from the body
• Inferior venacava: brings blood from the body
KIDNEYS
• INTRODUCTION
Bean shaped excretory organs
Paired organs
Location : below the rib cage on each side
Parts of kidney :
• Renal Capsule – outer membrane that surrounds the kidney
• Renal Pelvis – basin-like area that collects urine from the nephrons
• Cortex – the outer region of the kidney
• Medulla – inner region of the kidney
• Renal artery and renal vein
Functions
• remove wastes and extra fluid from your body
• maintain a healthy balance of water, salts, and minerals—such
as sodium, calcium, phosphorus, and potassium—in your blood.
LAB SAFETY
• https://www.youtube.com/watch?v=VGeUcQ5s3jw
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