SS1 First Term Biology Lesson Note – Cellular Respiration

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WEEK 8

SUBJECT: BIOLOGY

CLASS: SS1                                                               DATE——————–

TOPIC: SOME PROPERTIES AND FUNTIONS OF CELLS (continued)

CONTENT:

1. Cellular Respiration
2. Excretion
3. Growth

SUB-TOPIC 1: CELLULAR RESPIRATION

Respiration is the enzymatic breakdown of organic food substances, like glucose, through a series of chemical reactions in the cell to release energy and produce carbon (iv) oxide and water as by-products. Respiration occurs in all living cells.

Now, the energy released during respiration is used by the organism for such activities as synthesis of proteins, lipids and protoplasm; germination; cell division and enlargement leading to growth; movement; transmission of nerve impulses; active transport and maintenance of body temperature. There is variation in the amount of energy used by different organisms depending on their activities. A very active organism like Tiger uses much more energy than a sluggish one, like Chameleon.

The reactions that occur in cellular or tissue respiration are usually represented by the following equation:

C₆H₁₂O₆  +  6O₂  → 6CO₂   +  6H₂O  + Energy

The equation represents only a summary of the raw materials and the end products of tissue respiration. The complex pathway of cellular respiration is shown below:

Tissue respiration is divided into two main parts. The first is the glycolysis, the stepwise series of reactions which leads to the breakdown of glucose to pyruvic acid. The process occurs in the cytoplasm in the cells. It consists of step- wise reactions, each brought about by specific enzymes. Glycolysis is common to, and occurs in the same general manner in all organisms. In animal cell,

TYPES OF RESPIRATION

You already know that we have external and internal respiration, while external deals with breathing in and out i.e. inhalation and exhalation, the internal which takes place in the cell hence, cellular respiration is divided into two basic parts:

1. Anaerobic Respiration and
2. Aerobic Respiration

Anaerobic respiration is that type which involve the use of very little or no Oxygen, while Aerobic Respiration is that type which involves the use of large amount of Oxygen.

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