Facilitated Diffusion

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What is facilitated diffusion? In membrane, there are protein channels (pores) that allow polar molecules (soluble in water but not soluble in lipids) to move through them. The molecules that move through these channels never come into contact with the hydrophobic layer or the membrane's polar surface because these channels provide a continuous pathway for molecules that are moving through them. In this type of diffusion, like simple diffusion, no energy is consumed. Large and polar molecules require help to pass through the membrane. This help is done by a type of protein called carrier (transport) protein . To pass through the membrane, a molecules binds (temporarily) with carries protein in lipid bilayer and is transported from an area of higher concentration to an area of lower concentration.  Related topics: Simple Diffusion
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What is development?gonads-fertilization-embryology

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What is development?

 DEVELOPMENT  is a process by which a multicellular organism arises through mitotic division of a single cell-the fertilized egg or zygote and produces the whole body. The study of development is known as developmental biology. The whole development process is studied under different fields.

Gonads are the sex organs that produce gametes that are the foundation of development. In human, male has one pair of gonads outside the body. Male gonads are called testes(sing. Testis) and female also has a pair of gonads inside the abdomen gonads are called ovaries(sing. ovary).

Gametes are the sex cells. Female gamete is called an egg and male gamete is called a sperm

Fertilization (See Fertilization) is a process  in which an egg from female is fused with a sperm from male. Now the egg is called fertilized egg or zygote.


 Embryo/Embryology

 is the early development stage of multicellular organisms that begins just after the egg is fertilized. In developmental biology, the development of embryo is called embryogenesis. The study of animal development has traditionally been called as embryology.

Each day we replace more than a gram of our skin cells(the older cells being sloughed off as we move) by mitosis, and our bone marrow sustains the development of millions of new red blood cells every minute of our lives.

 

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