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Physiology

Mitochondrion – Structure and Function

The mitochondria are called the “powerhouses” of the cell. Without them, cells would not be able to draw out adequate energy from the nutrients, and basically all cellular functions would stop. All cells in the body, with the exception of fully grown red blood cells, have from

Difference Between DNA And RNA

Feature DNA RNA Sugar Types of nitrogenous bases Variety of nitrogenous bases Variety of nucleotide chains Site of action Function Deoxyribose A, T, C, G Balances 108 base sets 2 (double helix) Functions in nucleus; can not leave Codes for synthesis of RNA and protein Ribose A, U,

Homeostasis – Role and Component

‘Homeostasis’ refers to the maintenance of a constant internal environment of the body (homeo = same; stasis = standing). The importance of internal environment was notified by the great biologist of 19th century Claude Bernard. He enlightened the fact that multicellular organisms including man live in a

Excitation – Contraction Coupling

The action potential generated at the motor end plate region spreads along the membrane of skeletal muscle cell and into the T tubules. The T tubules contain dihydropyridine receptors that connect to the Ca++ channels of sarcoplasmic reticulum. Depolarization of T tubules opens the sarcoplasmic reticulum Ca++

The Location, Structure and Function of Olfactory and Taste Receptors

The sensory receptors for special senses are localized rather than widely distributed, and they, like all sensory receptors, are specialized to respond to only certain types of stimuli. There are three different kinds of sensory receptors for the special senses. Taste and olfactory receptors are chemoreceptors, which

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