9th biology dignostics exam answers

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Information about 9th biology dignostics exam answers
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Published on March 14, 2014

Author: sofipaz1

Source: slideshare.net

9th GRADE Sofia Paz

CELLS come together to form tissues.

ORGANS come together to form systems.

 The NERVOUS system sends and receives body messages.

LIGAMENTS hold bone to bone at joints.

 ENDONS hold muscles to bones.

Cell  An biological unit of all organisms  An autonomous self-replicating unit that may exist as functional independent unit of life (as in the case of unicellular organism), or as sub- unit in a multicellular organism (such as in plants and animals) that is specialized into carrying out particular functions towards the cause of the organism as a whole.

 Tissue  An aggregate of cells in an organism that have similar structure and function. Tissues work in unison to carry out a specific set of functions form an organ. The fundamental types of tissues in animals are epithelial, nerve,connective, muscle, and vascular tissues whereas in plants, they are the meristematic (apical meristem and cambium), protective (epidermis andcork), fundamental (parenchyma, collenchyma an d sclerenchyma) and vascular (xylem and phloem) tissues.

Organ  A group of tissues that perform a specific function or group of functions, and belongs to an organ system.

Trachea The windpipe. A fibrocartilaginous tube lined with mucous membrane passing from the larynx to the bronchi.

 Arteries  blood vessel carrying blood away from the heart, walls have smooth muscle and are innervated by the sympathetic nervous system. A blood vessel that carries blood from the heart to the body.  An artery carries large volumes of oxygenated blood to the major organs of the body.

 Veins  Blood vessel that returns blood from the microvasculature to the heart, walls thinner and less elastic than those of artery.

 Capillary  Any one of the minute vessels that connect the arterioles (thin arteries) and venules (thin vains), forming anetwork in nearly all parts of the body.  Their walls act as semipermeable membranes for the interchange of various substances, including fluids, between the blood and tissue fluid

 Smooth muscle  muscle tissue in vertebrates made up from long tapering cells that may be anything from 20-500m long.  smooth muscle is generally involuntary

 Organism  An individual living thing that can react to stimuli, reproduce, grow, and maintain homeostasis. It can be a virus, bacterium, protist, fungus, plant or an animal.

 How do cells multiply?

Name 4 types of primary tissues and explain briefly their main role.  Epithelial tissue (skin,digestive tract, reproductive tract…): Protection, absorption,elimination of waste product  Connective tissue(blood, bones…): support and bind other tissues as well as they give shape to organs and holds them in place.  Muscle tissue (muscles, including cardiac muscle…): locomotion or movements within internal organs.  Nervous tissue (brain,spinal cord, nerves…)

 Which is the largest organ in our body and which is its role.  the skin is often known as "the largest organ of the human body". This applies to exterior surface, as it covers the body, appearing to have the largest surface area of all the organs. Moreover, it applies to weight, as it weighs more than any single internal organ, accounting for about 15 percent of body weight. For the average adult human, the skin has a surface area of between 1.5-2.0 square meters, most of it is between 2-3 mm thick. The average square inch of skin holds 650 sweat glands, 20 blood vessels, 60,000 melanocytes, and more than a thousand nerve endings

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