Gas Exchange
Akopọ
Every cell in your body needs a steady supply of oxygen for aerobic respiration and must get rid of carbon dioxide waste. Plants face a similar challenge: their cells need CO₂ for photosynthesis and release O₂ as a by-product. Gas exchange is the process that moves these gases between an organism and its environment, and it depends entirely on diffusion.
In this lesson you will explore how the human lungs and the plant leaf are structured for efficient gas exchange, how the breathing mechanism ventilates the lungs, and why smoking damages the system. Edexcel tests gas exchange with diagram-labelling, data-response, and extended-writing questions across both papers.
Awọn Afojusun
- Understand the role of diffusion in gas exchange
- Understand gas exchange (of carbon dioxide and oxygen) in relation to respiration and photosynthesis
- Understand how the structure of the leaf is adapted for gas exchange
- Describe the role of stomata in gas exchange
- Understand how respiration continues during the day and night, but that the net exchange of carbon dioxide and oxygen depends on the intensity of light
- Investigate the effect of light on net gas exchange from a leaf, using hydrogen-carbonate indicator
- Describe the structure of the thorax, including the ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli and pleural membranes
- Understand the role of the intercostal muscles and the diaphragm in ventilation
- Explain how alveoli are adapted for gas exchange by diffusion between air in the lungs and blood in capillaries
- Understand the biological consequences of smoking in relation to the lungs and the circulatory system, including coronary heart disease
- Investigate breathing in humans, including the release of carbon dioxide and the effect of exercise
Àwòrán ọpọlọ
A ti ṣe àwòrán kókó yìí kí o lè rí bí àwọn èrò ṣe so pọ̀.
Ṣí àwòrán ọpọlọ nínú áàpù
Káàdì ìrántí
Ìdánrawò kíákíá lórí ohun tí wọ́n ń dán wò nínú kókó yìí.
Ṣe ìdánrawò káàdì wọ̀nyí nínú áàpù
Akọ̀wé Ẹ̀kọ́
Àkọsílẹ̀ Ẹ̀kọ́ Pípé wà lórí Ohun Èlò Green Bridge
Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Gas Exchange. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which structure is the site of gas exchange in the lungs? A) Bronchus B) Trachea C) Alveolus D) Bronchiole Answer: C
- During inhalation, what happens to the diaphragm? A) It relaxes and domes upward B) It contracts and flattens C) It stays still D) It moves to the left Answer: B
- Which component of cigarette smoke reduces the oxygen-carrying capacity of the blood? A) Tar B) Nicotine C) Carbon monoxide D) Particulates Answer: C
- At night, a plant's net gas exchange at the stomata is: A) CO2 taken in, O2 released B) O2 taken in, CO2 released C) No exchange occurs D) O2 and CO2 both released Answer: B
- Which of these is NOT an adaptation of alveoli for gas exchange? A) Thick walls for protection B) Large surface area C) Rich blood supply D) Moist lining Answer: A
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Breathing
Describe how the structures of the lungs and thoracic cavity control the mechanics of breathing
"Biology: Breathing" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/39-3-breathing. Access for free at https://openstax.org/books/biology/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Systems of Gas Exchange
Describe the passage of air from the outside environment to the lungs
"Biology: Systems of Gas Exchange" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/39-1-systems-of-gas-exchange. Access for free at https://openstax.org/books/biology/pages/1-introduction
Àwọn àjọ mìíràn ló tẹ̀ wọ́n jáde lábẹ́ ìwé àṣẹ ṣíṣí, a sì dá wọn lọ́lá bí wọ́n ṣe béèrè. Àwọn ìjápọ̀ ń ṣí ojú òpó wọn.
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Gas Exchange? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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