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What are four different cells in the human body and why are they adapted to their jobs?

Answer 1

There are many organs and tissues in human body. Thus there are a huge number of different cells. I would choose neuron, leucocyte, erythrocyte and a muscle cell for you.

Neuron is present in nerve tissue; the cell acts as an electrical wire to transmit impulse. Neuron has one/many branches. Receptive branches are dendrites (sensory) while despatching branch is axon (motor). Unique characteristic of neuron is that it is not capable to divide after embryonic life, hence can not be replaced when dead.

I have chosen leucocytes and erythrocytes: both present in blood- commonly called white blood cells (WBCs) and red blood cells (RBCs) respectively. Both the cells are in circulation but are generated regularly within red bone marrow from stem cells.

RBCs are more numerous, cytoplasm packed with red pigment protein Haemoglobin. Nucleus of such cell is lost during maturation of the cells. RBCs are responsible for carrying oxygen.

WBCs are less in number, nucleated cells with ability to move by producing pseudopodia. Thus WBC could be called as an amoeboid cell. These cells are providing us immunity against invading germs.

Muscle cells are contractile in nature. There are special protein myosin and actin within cytoplasm of muscle cell. Contraction and relaxation of muscle cells help in skeletal movement, peristalsis, glandular secretion, etc.

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Answer 2

Oliver Antoine

The human body is made up of four different types of cells: 1. Red blood cells: These cells are adapted to carry oxygen throughout the body because of their biconcave shape and lack of a nucleus, which maximizes their surface area for oxygen exchange. 2. Neurons: These cells are specialized for sending electrical signals throughout the body, and they have long extensions called axons and dendrites that facilitate rapid communication between cells. 3. Muscle cells: These cells are made for contraction and movement, and they contain specialized proteins like actin and myosin that allow for the generation of force. 4. Epithelial cells: These cells form protective layers covering surfaces like skin and lining organs. They have tight junctions between cells to create barriers against pathogens and regulate the passage of substances around them.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.