All organisms are composed of cells—the fundamental unit of life. Groups of specialized cells cooperate to form a tissue, such as a muscle. Different tissues are in turn grouped together to form larger functional units, called organs.

Understandings: Specialized tissues can develop by cell differentiation in multicellular organisms & differentiation involves the expression of some genes and not others in a cell’s genome.

Sci 7 – Cell specialization

multicellular organisms

Nerve cells, blood cells, and reproductive cells are examples of specialized cells. Nerve cells, called neurons, have long connections that help them transmit messages throughout our nervous system.

There are 4 basic types of tissue: connective tissue, epithelial tissue, muscle tissue, and nervous tissue. Connective tissue supports other tissues and binds them together (bone, blood, and lymph tissues). Epithelial tissue provides a covering (skin, the linings of the various passages inside the body).

In contrast, multicellular organisms can divide up these functions among different types of cells. This is known as cell specialization. Your body contains over 200 different types of specialized cells. Each type is adapted to do a particular job well and has developed special features to do it.

Notes & Videos [1.1. 3] Compare a variety of specialized cells and understand how the functions of these cells vary.

• NEURONS. Neurons are specialized cells that carry messages within the human brain.
• MUSCLE CELLS. Muscle cells make movement possible.
• SPERM CELLS.
• RED BLOOD CELLS.
• WHITE BLOOD CELLS.

Absorptive cells, or enterocytes, are the predominant epithelial cell type lining the lumen of the small intestine and colon. These cells are specialized for absorption of nutrients across the apical plasma membrane and export of these same nutrients across the basal plasma membrane.

Answer: The body would be unable to maintain homeostasis because the cells of the body would have too many jobs to do. The cells likely would not be able to do all of these jobs.

Non-cellular life, or acellular life is life that exists without a cellular structure for at least part of its life cycle. The primary candidates for non-cellular life are viruses. Some biologists consider viruses to be living organisms, but others do not.

No, humans cannot live without cells. It is because cells are responsible for all the life processes occuring our body. It is because of cell that we and every living organisms exists. Cell is the most important thing in the body system of all living organism.

Yes , individual cells are life forms and most of the ones that compose your body are alive. Living things are composed of cells. 2. Living things have different levels of organization.

The length of a cell’s life can vary. For example, white blood cells live for about thirteen days, cells in the top layer of your skin live about 30 days, red blood cells live for about 120 days, and liver cells live about 18 months.

Permanent cells are cells that are incapable of regeneration. These cells are considered to be terminally differentiated and non-proliferative in postnatal life. This includes neurons, heart cells, skeletal muscle cells and red blood cells.

Nerve Cells Do Not Renew Themselves Yet, nerve cells in your brain, also called neurons, do not renew themselves. They do not divide at all. There are very few exceptions to this rule – only two special places in the brain can give birth to new neurons.

The Birth of a Cell First, existing cells can divide via a fairly simple process called mitosis. During mitosis, a parent cell splits into two new cells. These new cells, called daughter cells, are basically copies of the original cells.

every 7 to 10 years

Body tissues grow by increasing the number of cells that make them up. When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two.

skin