"Discharge of Waste from the Human Body" PPT Courseware 5

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"Discharge of Waste from the Human Body" PPT Courseware 5

Self-study tips:

Please read the contents of P72-76 of the textbook carefully and silently, pay attention to the illustrations in the textbook and the text below, find out the answers to the following questions and outline them. After 5 minutes, compare who can answer the questions faster and better.

1. What is excretion?

2. Describe the composition and function of the human urinary system through observation and thinking?

3. What is a nephron? what is it composed of? What changes occur in the composition of blood as it passes through the nephron?

4. How is original urine formed? What is the difference between raw urine and urine?

5. What is the meaning of urination?

6. What are the pathways of excretion? Is sweat made of the same ingredients as urine?

What waste products are there in the human body?

Excretion: The process by which the human body excretes metabolic wastes such as carbon dioxide, urea, water and inorganic salts produced by the oxidation and decomposition of organic matter in tissue cells.

Elimination: The process in which the remains of digested food are excreted from the body in the form of feces.

kidney

1. Describe the location of the kidneys.

The kidneys are located on both sides of the spine on the posterior wall of the abdominal cavity, one on each side.

2. Describe the morphological structure of the kidney.

It is shaped like a broad bean, slightly flattened front and back, with a smooth surface and a reddish-brown color.

NOTE: The kidneys are the organs that form urine.

discuss:

1. What organs does the urinary system consist of?

The urinary system is mainly composed of kidneys, ureters, bladder, and urethra.

2. Pay attention to the renal arteries, renal veins and the color of the kidneys. Based on the knowledge you have learned, imagine the distribution of blood vessels in the kidneys? How does blood flow in and out of the kidneys?

Blood flows into the kidneys through the renal arteries and out of the kidneys through the renal veins. The color of the kidney is purple-red, indicating that there are abundant capillaries in the kidney.

What do you think is the relationship between the formation of urine and blood circulation?

Answer: There is a close relationship. The blood in the renal artery carries urea, inorganic salts and excess water produced by human life activities to the kidneys, forming urine and excreted from the body. The renal vein carries blood excluding urea, inorganic salts and excess water to other parts of the body.

meaning of urination

Remove waste from the body

Regulate the balance of water and inorganic salts in the body

Maintain normal physiological functions of tissue cells

The formation and discharge of sweat

1. What two parts do sweat glands consist of?

Sweat glands include secretory parts and ducts.

2. How is sweat formed and discharged?

There are abundant capillaries around the sweat glands. When blood passes by, water, inorganic salts, urea and other substances in the blood enter the sweat glands to form sweat. Sweat is expelled from the body through long, thin ducts.

practise:

1. Compared with original urine, urine does not contain ( )

A. Glucose B. Urea

C. Inorganic salts D. Glucose and inorganic salts

2. When protein and blood cells are found in urine, the location of kidney disease is ( )

A. Renal capsule B. Collecting duct

C. Glomerulus D. Renal tubule

3. After blood flows through the kidneys, the main changes that occur are ( )

A. Increase in nutrients B. Decrease in urea C. Increase in oxygen D. Increase in urea

4. The formation of urine is continuous, but the discharge of urine is intermittent. This is because ( )

A. Glomerular filtration

B. Renal tubules have reabsorption effect

C. The collecting duct has the function of absorbing urine

D. The bladder has the function of storing urine.

5. Someone’s urine output increases several times compared with normal conditions. It is speculated that the location of the disease is ( )

A. Glomerulus B. Renal capsule C. Renal tubule D. Renal capsule wall

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For more information about the PPT courseware "Waste Discharge from the Human Body", please click the "Waste Discharge from the Human Body" PPT tab.

"Discharge of Waste from the Human Body" PPT Courseware 6:

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"Discharge of Waste from the Human Body" PPT Courseware 4:

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"Discharge of Waste from the Human Body" PPT Courseware 3:

"Excretion of Waste in the Human Body" PPT Courseware 3 1. Excretion Concept: The process by which wastes such as carbon dioxide, urea and excess water produced when the substances in the body are decomposed are excreted from the body. Pathways: 1) Skin: excretes water, inorganic salts, and urea in the form of sweat 2) Respiration..

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Update Time: 2024-11-22

This template belongs to biology courseware People's Education Press seventh grade biology book volume 2 industry PPT template

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