Stages of Respiration
Generally, respiration consists of the following two basic stages:
- External Respiration: It is of two types, as follows
- Breathing: It is the process by which air rich in oxygen is taken inside the body of an organism and CO2-concentrated air expelled from the body.
- Gaseous Exchange: It involves the diffusion of O2 from the lungs to blood and CO2 from the lungs to the blood.
- Internal Respiration: It refers to the gaseous exchange between the arterial blood and the body cells.
Also Read: Respiration in Plants
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Exchange of Gases in Plants |
Exchange of Gases in Animals |
| In plants exchange of gases occurs through stomata and large intercellular spaces present throughout the plant body. | Animals have evolved different organs for the uptake and out of gases. These organs work together and constitute the respiratory system of an organism. |
| In leaves, gaseous exchange takes place by diffusion of oxygen through stomata into the cells of the leaf. | The aquatic organisms utilize oxygen dissolved in water for respiration where the amount of dissolved oxygen is fairly low then the amount of air oxygen. |
| The exchange of gases in the roots of a plant takes place by the process of diffusion from the air present in between soil particles. | Terrestrial organisms use atmospheric oxygen for respiration. This oxygen is absorbed by different organs in different animals. |
| In woody plants, gaseous exchange occurs through the small pores found on stems called lenticels. | Amoeba and planaria have cell membranes as their respiratory surface. Birds, lizards, and terrestrial organisms have lungs for respiration. |
| All the parts of a plant perform respiration individually. | An animal performs respiration as a single unit. |
| Respiration occurs at a much slower rate. | Respiration occurs at a faster rate. |
CBSE Class 10 Science Notes Chapter 5 Life Processes
The process that all living organisms perform to maintain their life is called life processes. Living creatures must keep repairing and sustaining their structures. Different maintenance functions are required to regulate the proper functioning of a body. Thus, the process which maintains the body’s functions and is necessary for survival are called life processes. Let’s have an overview of all these life-maintaining processes which describe the qualities of organisms, whether alive or not.