"Discharge of Human Waste" PPT

Description

"Discharge of Human Waste" PPT

Part One: Introduction of New Course

We all excrete a certain amount of urine every day. Through urination, we excrete some waste and excess water from the body. What is the source of urine? How is urine formed?

learning target

1. Outline the formation and elimination process of urine.

2. Outline other excretion pathways of the human body and their main excretion products.

PPT on the excretion of human waste, part 2: formation and excretion of urine

discuss

1. What is original urine?

The fluid in the renal capsule is urine.

2. Compare what happens to the composition of urine and plasma? What substances do you think are mainly excreted during urination?

Compared with plasma, there is no protein, glucose, or amino acids in urine. The content of inorganic salts and urea per liter of urine is significantly increased, and the water content is slightly increased.

Urine excretes mainly inorganic salts and urea, and in addition, excess water.

3. Comparing the components of plasma and original urine, what is the role of glomerulus and glomerular cyst wall?

Compared with plasma, the fluid in the renal capsule contains less protein and more glucose, amino acids, inorganic salts, water and urea. This shows that the walls of the glomerulus and renal capsule can pass through small molecular substances but rarely through macromolecular substances such as proteins.

4. Glucose appears in the original urine but not in the urine. What does this mean about the function of the renal tubules?

PPT on the discharge of human waste, part three: think about it

1. The formation of urine is continuous, but the discharge of urine is intermittent. Why?

The bladder stores urine

Urination is controlled by the brain

2. What is the significance of human urination?

remove waste;

Regulate the content of water and inorganic salts in the body;

Maintain normal physiological functions of tissue cells.

Please note

The amount of urine output mainly depends on the amount of water the body takes in every day and the amount of water excreted through other channels.

The kidneys have the function of automatically adjusting the composition of urine within a certain range.

Everyone should drink enough water every day. Because when a person excretes less than 500mL of urine a day, the waste produced in the body cannot be excreted in time and accumulates in the body, causing harm to the body.

PPT on the discharge of waste from the human body, part 4: other ways by which the human body discharges waste

Excretion is the process by which the body excretes waste products such as urea, carbon dioxide, excess water and inorganic salts from the body.

Elimination is the process by which undigested food residues and other substances are formed into feces in the large intestine and excreted from the body through the anus. Such as human defecation.

Skin perspiration (partial water and a small amount of urea, inorganic salts)

Breathe (remove carbon dioxide and a small amount of water)

PPT on the discharge of human waste, Part 5: Feedback in class

1. Compared with the original urine, the urine of healthy people does not have the following components: ( )

A.Urea B.Water C.Glucose D.Inorganic salt

2. The entire process of urine formation goes through ( )

A. Renal tubular reabsorption

B. Reabsorption by renal corpuscles

C. Glomerular filtration and collecting duct collection

D. Glomerular filtration and tubular reabsorption

3. Compared with blood, the main difference between raw urine and blood is that raw urine does not contain ( )

A. Blood cells and inorganic salts B. Blood cells and urea

C. Urea D. Blood cells and macromolecule proteins

4. The formation of urine is continuous, while the discharge of urine is intermittent. The main reason is ( )

A. Reabsorption by renal tubules B. Control by kidneys

C. The storage function of the bladder D. The urinary function of the nephron

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware for the second volume free download, human body waste discharge PPT download, .PPT format;

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"Discharge of Human Waste" PPT courseware:

"Emission of Waste from the Human Body" PPT Courseware Part One: Introduction of New Lesson Why must the human body excrete waste from the body? Do waste products excreted by the human body need to be treated before being released into the environment? Learning Objectives 1. Pay attention to the disposal of waste products excreted by the human body. 2. List people..

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Update Time: 2024-11-24

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