Is it possible for an organism to exist without tissues?

Is it possible for an organism to exist without tissues?

By definition, tissues are absent from unicellular organisms. Even among the simplest multicellular species, such as sponges, tissues are lacking or are poorly differentiated.

Why do multicellular organisms generally live longer than unicellular organisms?

Multicellular organisms are larger, more efficient, and have a longer lifespan than unicellular organisms. The cells are specialized and must depend on each other for survival of the organism.

What are three benefits of being multicellular?

What are 3 benefits of being multicellular?

• Intelligence and Evolution.
• Bigger Is Better.
• Less Stress Equals A Longer Lifespan.
• Cells Can Take Care Of Each Other.
• More Energy Is Needed For Normal Functioning.
• Infection Becomes A Possibility When Multicellular.
• Takes Longer To Reach Maturity And To Breed.

What is the smallest unit of life in the body?

cell
A cell is the smallest unit of a living thing. A living thing, whether made of one cell (like bacteria) or many cells (like a human), is called an organism. Thus, cells are the basic building blocks of all organisms.

Why is multicellular better?

Multicellular organisms thus have the competitive advantages of an increase in size without its limitations. They can have longer lifespans as they can continue living when individual cells die. Multicellularity also permits increasing complexity by allowing differentiation of cell types within one organism.

What are disadvantages of being multicellular?

Following are the disadvantages of multicellularity: A multicellular organism needs more food than unicellular organsism because it needs more energy. In multicellular organisms, cells are organized into tissues and tissues are further organised into organs. So, if one organ fails, then whole organism can fail.

Why can’t the individual cells of a multicellular organism live on their own?

Compared to unicellular organisms, multicellular are also more complex given that they are made up of different types of specialized cells that carry out different functions. Moreover, individual cells of multicellular organisms cannot carry out all the functions that are necessary for life.

Where does cardiac muscle tissue con-stitute the heart?

Cardiac Muscle Cardiac muscle tissueoccurs only in the heart, where it con- stitutes the bulk of the heart walls. Like skeletal muscle cells, cardiac muscle cells are striated, but cardiac muscle is not volun- tary.

Why is there no cancer in the heart?

The heart, in contrast, doesnt get exposed to many carcinogens, just those in the blood. That, combined with the fact that the heart cells do not often replicate, is why you dont see much cancer of the heart muscle. Indeed, according to cancer statistics, it does not appear to occur at any measurable rate.

Why does the heart not get tired like the hand?

One answer is that the “cardiac” muscle that comprises the heart is of a different kind than the “skeletal” muscle comprising the hand. Skeletal muscles are attached to bone structures and cannot stay long in a flexed position without depleting their energy reserves.

Is the muscle of the heart volun Tary?

Like skeletal muscle cells, cardiac muscle cells are striated, but cardiac muscle is not volun- tary. Indeed, it can and does contract without being stimulated by the nervous system. Most of us have no conscious control over how fast our heart beats. ● Key words to remember for cardiac muscle are cardiac, stri- ated, and involuntary.