Cellular Respiration

CELLULAR RESPIRATION

D.P Mashapa

Open Ended

Aerobic organisms need oxygen to survive. Please describe what would happen if such organisms experience lack of oxygen. Your answer must include what is happening physiologically as well as the role of oxygen in aerobic organisms.

Cellular respiration

Is a chemical process where glucose is broken down gradually in the presence of oxygen (aerobic), or absence of oxygen (anaerobic)

Where do you think the glucose comes from?

• the atmosphere

• the ground

• food we eat

• the ocean

Uses of energy

• cell division

• growth

• movement

• transport of substances

• active transport

Aerobic cellular respiration

• occurs in the presence of oxygen

• takes place in the cytoplasm and mitochondria of the cell

• THREE stages of aerobic cellular respiration

• Glycolysis

• Krebs cycle

• Oxidative Phosphorylation

Multiple Select

what is the function of mitochondria?

• source of oxygen

• source of glucose

• organelle/ site of respiration

• provide water

Glycolysis

• occurs in the cytoplasm

• requires NO oxygen

• glucose is broken down into smaller molecules and energy is released and stored in energy rich-ATP molecules.

• high level of hydrogen ions are released

krebs cycle

• occurs in the mitochondria

• occurs only in the presence of oxygen

• carbon dioxide and hydrogen ions are released

• hydrogen carrier enzymes are used to transport hydron ions to the next stage

Oxidative phosphorylation

• also occurs in the mitochondria and in the presence of oxygen

• high energy hydrogen atoms are passed from one hydrogen carrier enzyme to the next, energy is released in the process

• energy is used to combine phosphate molecule to ADP (Adinosine Di-phosphate) molecule

• this results in the formation of ATP

Multiple Select

A phase that does not require oxygen

• Glycolysis

• Krebs cycle

• Oxidative phosporylation

• All of the above

Open Ended

What do you think happens in the absence of oxygen