The Human Body

The human body is an example of highly developed multicellular organism. It develops from a fertilized egg cell. This cell continues to multiply rapidly and forms all the tissues of the body. Each tissue has its function. A tissue is an aggregation of morphologically similar cells and associated intercellular matter that form an organ. A group of physiologically or anatomically complementary organs form a system. The systems carry out one of the main functions of the body. The human body has nine systems: skeletal, muscular, respiratory, digestive, circulatory, excretory, reproductive, nervous and glandular.
The anatomical parts of the body are the head, the trunk, and the upper and lower limbs. The vital organs of digestion, respiration, circulation and response to the environment lie in cavities in the head and trunk. The limbs that are used for locomotion or grasping are outgrowths from the trunk.

The human body is ___.
a. a sophisticated organ.
b. a complex organism consisting of millions of cells.
c. a far-fetched organism.
Tissues are ___.
a. the result of the multiplication of the cells.
b. representations of the egg cell.
c. multicellular organs.
The main functions of the body ___.
a. are performed by the organs.
b. are performed by the tissues.
c. are performed by the systems.
The human body is composed of ___.
a. head and trunk.
b. head, trunk and limbs.
c. head, trunk and nine systems.
The appendages joined to the trunk are ___.
a. the upper limbs.
b. the lower limbs.
c. the upper and lower limbs.

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