Excretion and Homeostasis

7/31/2019 Excretion and Homeostasis

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Subject: Biology Reader: X C Topic: Excretion in living organism week: 1st Date:

Objectives Methodology Time Resources Assessment

At the end of the

lesson the students willbe able to :

i). Define excretion.

ii). Identify ondiagrams and name the

unlabelled structuresalso and state the

function of each.

Introduction: brainstorming about excretion will be done

as a lesson starter.Teachers exposition:

through the image of urinary system the structures

involved in the process of excretion and their functions

Query /Random feed back:Describe how the removal of carbon dioxide from the

lungs is not considered as an excretory process. Justifyyour answer with valid reasons.

Written task:i) Define excretion.

ii) Identify on diagrams and name the kidneys, ureters,

bladder, urethra, and state the function of each.

Wrap up:Lesson will be summarized by the student.

5mins

12mins

5mins

3mins

8mins

2mins

Flip chart

showing the

image ofurinary system

Worksheet toidentify the

structures.

Students will be assessed on their ability to :

i) Define excretion as the removal of toxic

materials and the waste products of metabolismfrom organisms.

ii) Identify on diagrams and name the

unlabelled structures also and state the functionof each.

Evaluation of students learning:

What did the children learn in this lesson?

What did they actually do?

Evaluation of teaching:

What went well? How do you know?

What went wrong? How will you fix it?


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Beaconhouse School SystemJuniper Campus

Quetta.

Worksheet for Excretory system in Humans

Name:_______________________ Class:_________


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Note that ureter and urethra must be spelt correctly. Stress that it is excess water which is removed and refer to this helping tomaintain the blood at a constant concentration.An OHT diagram identifying the structures may be shown to students who may then label their own copy.Students may add annotations (An annotation is a note that is made while reading any form of text.) to their diagram to describe the function of each labelled

component.


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Subject: Biology Reader: X C Topic: Structure and function of Kidney week: 1st Date:


At the end of the

lesson the students willbe able to :

i).

Introduction :

Teachers exposition: structure ofQuery :

Pair work

Random feed back:

Wrap up:









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Subject: Biology Reader: X C Topic: Dialysis week: 1st Date:


At the end of thelesson the students will

be able to :

i). describe dialysis inkidney machines.

Recap: name the structures that make the urinary systemalso state the function of each.

Teachers exposition:Through labeled diagram of a kidney dialysis machine

the process of dialysis will be explained.

Query :Student will be allowed to ask topic related questions.

Random feed back:Student will explain their understanding about the use of

kidney machine for dialysis.

Written task:

Describe dialysis in kidney machines as the diffusion ofwaste products and salts.

Wrap up:

The process of dialysis will be summarized by a student.

5mins

12mins

3mins

4mins

10mins

2mins

labeled diagram

of a kidneydialysis

machine

http://healthsciences.merlot.org/

images/18loop.

gif


Describe as a written task about dialysis inkidney machines as the diffusion of waste

products and salts (small molecules).Through a

membrane; large molecules (e.g. protein)remain in the blood.
http://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gif


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Use the suggested online animation to demonstrate the movement of substances across the dialysis membrane and to show that the content andconcentration of the dialysis fluid controls which substances leave the blood.http://healthsciences.merlot.org/images/18loop.gif

Or Teachers exposition could be

Submerge lengths of Visking tubing, tightly tied at both ends, in distilled water. One tube should contain a solution of egg albumen (use dried albumen

to make the solution) and the other a solution of glucose. After 30 minutes test the distilled water for the presence of protein and reducing sugar.As students will have met Visking tubing as a partially permeable membrane associated with osmosis in Unit 1 it will be necessary to explain that water

molecules are not the only ones able to pass through (N.B. Visking tubing is available with different-sized pores.)

Homeostasis introduction:http://www.s-cool.co.uk/gcse/biology/homeostasis/what-is-homeostasis.html

Subject: Biology Reader: X C Topic: Homeostasis week: _____ Date:



be able to :

i).Definehomeostasis.

ii). Explain the process

of control by negative

feedback.

Introduction: need of maintaining the constant internal bodyenvironment will be discussed through brainstorming.

Teachers exposition:Students may watch the suggested animated video followingwhich a class brainstorm can be used to list the bodyfunctions controlled by homeostasis and the organs involved.Query/ oral feedback: student will be allowed to ask the topic

related questions OR student will Define homeostasis.

Pair work

Study the provided negative feed back cycle diagram anddiscuss with the partner about the activity it perform. Studentmay take help from the book.

Oral feed back:Use the negative feedback cycle diagram to explain the steps

involved in controlling a constant room temperature and thendiversify to explain the control of homeostatic functions inthe body.

Written task:Explain the process of control by negative feedback.

Wrap up: A student will summarize the lesson.

6mins

10mins

3mins

5mins

5mins

6mins

2mins

Homeostasisanimated video:

http://www.bbc.co.uk/schools/g

csebitesize/science/add_aqa/ho

meo/homeosts.shtml

Negative

feedback cycle:http://www.bbc.co.uk/scotland/l

earning/bitesize

/higher/biology/images/01stages

_negativefdback.gif


Define homeostasis as the maintenance of aconstant internal environment.

Explain the process of control by negativefeedback.
http://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gifhttp://healthsciences.merlot.org/images/18loop.gif


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Internal environment may be explained as conditions within the body.

Homeostasis may be split into homeo (meaning the same) and stasis (meaning staying or standing).

The operation of a thermostat illustrates the concept well, but it should be explained that temperature is not the only variable that canbe controlled. An introduction relating to temperature control leads comfortably on to outcome 10(d).

Use the negative feedback cycle diagram to explain the steps involved in controlling a constant room temperature and thendiversify to explain the control of homeostatic functions in the body.


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Through the hypothalamus and pituitary glands the has a long-lasting and powerful effect on the body by involving hormones.

The monitors water, temperature and carbon dioxide content of blood.

The gland secretes a number of hormones, a key one is ADH which is important in regulating the water content of the body.


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The helps to control glucose content of the body by storing it as glycogen. It is also involved in temperature regulation, acting as the body's furnace by increasing the rate of

respiration when we are cold.

The are involved by getting rid of carbon dioxide from the body.

The is involved in maintaining a constant amount of glucose in the body through the actions of glucagon and insulin.

The of the body can help to maintain a stable body temperature as muscular activity and shivering help to generate heat.

The are involved in controlling the amount of water in the body.

The is the largest organ and has a central role in maintaining a constant temperature.

All of our cells are bathed in a watery solution, which is formed by some of our blood plasma which is allowed to leak out of our blood. This carries away any waste materials back into

the blood.

The balance of things in this tissue fluid is critical for the cells and the whole body.

Extra carbon dioxide must be removed, otherwise the body becomes too acidic. It is lost mainly in the air we breathe out, but a small amount is lost in the urine.

This is the waste chemical produced when we digest amino acids in the liver. It is poisonous and so must be removed. This is done mainly through the urine, although some is lostthrough our sweat.

If the right balance of ions is not kept, our cells can become shrivelled, swollen or even burst!

Important ions include sodium, potassium, hydrogen and phosphate. These are controlled through our urine and the amount of water we drink. We also lose some, like sodium ions,

through our faeces and our sweat.


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Having enough for plus adequate storesof is critical. If the blood glucose level falls too lowwe will die.

Seventy percent of our body mass is water. Without keeping the right amount of water we would die. The kidney is the key means of this control (see later).

The enzymes that control every chemical reaction in our body work best at their temperature of 37 degrees Centigrade. If our body cells get too hot or too cold they would

die. So would we!

hen (Water)

hall (Sugar)

(Ions)

lean (CO2)

he (Temperature)

tensils (Urea)

1. Fill in the missing words...

Why do we need homeostasis?

If there was not a constant___(i)___environment, our___(ii)___would not work properly. That would mean that nothing would operate properly and

we would___(iii)___.

(Marks available: 3)

Answer
http://www.s-cool.co.uk/gcse/biology/homeostasis/test-it/exam-style-questionshttp://www.s-cool.co.uk/gcse/biology/homeostasis/test-it/exam-style-questions


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Answer outline and marking scheme for question: 1

(i) internal;

(ii) enzymes;

(iii) die.

(Total = 3 marks)

2. Name 3 organs of the body that are involved in homeostasis and briefly explain what they do.


Answer


Choose any 3 of the following, with a short summary of what they do...

Through the hypothalamus and pituitary glands the brain has a long-lasting and powerful effect on the body by involving hormones.

The hypothalamus monitors water, temperature and the level of carbon dioxide in the blood.

The pituitary gland secretes a number of hormones - a key one is ADH, which is important in regulating the water content of the body.

The liver helps to control glucose content of the body by storing it as glycogen. It is also involved in temperature regulation, acting as the body?s furnace

by increasing the rate of respiration when we are cold.

The lungs are involved by getting rid of carbon dioxide from the body.

The pancreas is involved in maintaining a constant amount of glucose in the body through the actions of glucagon and insulin.

The muscles of the body can help to maintain a stable body temperature as muscular activity and shivering help to generate heat.

The kidney is involved in controlling the amount of water in the body.

The skin is the largest organ and has a central role in maintaining a constant temperature.


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(Total = 6 marks)

3. When there is too little water in the body, a sequence of events occurs. Fill in the missing words to complete the process:

Too little water in blood.

Detected by___(i)___.

More___(ii)___released into blood by the___(iii)___.

___(iv)___reabsorbs more water.

Less___(v)___produced.

Blood water level not reduced further.


Answer


(i) hypothalamus;

(ii) adh;

(iii) pituitary gland;

(iv) kidney;

(v)urine.

Subject: Biology Reader: X C Topic: week: Date:



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be able to :i).

Introduction :Teachers exposition:

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Subject: Biology Reader: X C week: 1st Date:



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be able to :i).


Query :Pair work

Random feed back:

Written task:

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Excretion and Homeostasis

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