Biology 8 Lesson 38: Excretion and structure of the urinary excretory system
1. Summary of theory
Excretion is the process of filtering and excreting waste products, toxic substances and excess substances into the environment outside the body.
b. The role of the excretory process
– Excretion makes the environment in the body stable, not toxic.
– Waste products that need to be excreted arise from the metabolic activities of cells and the body (CO2, urine, sweat,…), or from digestive activities put into the body a overdosage of substances (drugs, ions, cholesterol, ..)
1.2. Structure of the urinary system
– The urinary system consists of the kidneys, ureters, bladder, and urinary tract.
+ The kidney consists of 2 fruits: each fruit consists of a shell with functional units; marrow part; with collecting ducts, renal pelvis.
+ Each functional unit includes: glomerulus, glomerulus cyst, renal tubule.
⇒ Function to filter blood and form urine.
2. Illustrated exercise
Lesson 1: The functional units of the kidney include
A. Glomerulus, glomerular cyst, renal pelvis
B. Glomerulus, collecting duct, renal pelvis
C. Glomerulus, collecting duct, glomerular cyst, renal pelvis
D. Glomerulus, glomerular cyst, renal tubule
- Explanation: Each functional unit includes: glomerulus, glomerular cyst, and tubule.
- Choose the answer: EASY
Lesson 2: Who is most often at risk for hemodialysis?
A. Kidney donors
B. People in traffic accidents
C. People with kidney failure
D. People who smoke a lot
- Explanation: People with kidney failure have poor kidney function, so they can’t filter toxins in the body, leading to a backlog of toxic substances, forcing hemodialysis.
- Choose the answer:
Lesson 3: What are the major waste products of the body? Which organs are responsible for their excretion?
The main waste products of the body are CO2, sweat, and urine.
Organs that excrete the above products:
- The respiratory system removes CO2.
- The skin removes sweat.
- The urinary system removes urine.
3.1. Essay exercises
Question 1: How important is excretion in living organisms?
Verse 2: What is the structure of the urinary system?
Question 3: What is an essay? How important is excretory activity in the human body? Give an illustrative example.
3.2. Multiple choice exercises
Question 1: Which of the following does not excrete excretion?
Verse 2: What is the main role of excretion?
A. Make the environment in the body stable
B. Purify the body, remove excess nutrients
C. Ensure the nutrients in the body are always renewed
D. Helps to lose weight.
Question 3: What waste products are obtained from?
A. Cellular metabolic activities
B. Metabolic activities of the body
C. From the digestive activities put into the body some substances in overdose
D. All of the above answers
Verse 4: Which of the following products is produced by cellular metabolism?
A. Only the substances needed by the cell are produced
B. Only scum and residues are produced
C. Creates the substances necessary for the cells and wastes excess substances to be eliminated from the body
D. Generates CO2 to provide for the activities of the body and cells, remove insoluble wastes in the blood
Question 5: The structure of the urinary system includes:
A. Kidneys and urinary tract
B. Kidneys, ureters, bladder
C. Kidneys, ureters, bladder, ureters.
D. Kidneys, ureters, bladder, urinary tract, lungs, skin
After completing this lesson, you should:
- Understand the concept of excretion and its role with the living organism, the excretory activities of the body.
- Identify the structure of the excretory system on the picture (model) and describe in words the structure of the urinary system.