Question

sc.6.l.14.5 quiz form b body systems
11.(14.5)
in a living organism, what is an organ?
a. a group of similar cells that perform a common function
b. a structure composed of a number of tissues that work together to perform a specific task
c. a structure that provides a specific service within a cell
d. functional unit, or building block, of all organisms; smallest unit that can carry on the activities of life

13.(14.5)
cells routinely release waste as they perform their functions. in the human body, the waste is often released into the bloodstream. which organ removes much of this waste from the bloodstream so that it can then also be removed from the body?
a. the heart
b. the lungs
c. the kidneys
d. the stomach

14.(14.5)
the walls of the human heart are made of a specialized form of muscle tissue known as cardiac tissue. this cardiac, or heart, tissue contracts the chambers of the heart to cause rhythmical beating and blood circulation.
tissues in the human body, such as cardiac tissue, are made up of what?
a. blood
b. nerves
c. organs
d. cells

Explanation:

1. For question 11: By definition, an organ is a structure made of multiple different tissues that collaborate to carry out a specific function. Option A describes tissue, option C describes an organelle, and option D describes a cell.
2. For question 13: The kidneys are the primary organs responsible for filtering waste products from the bloodstream and producing urine to eliminate that waste from the body. The heart pumps blood, the lungs exchange gases, and the stomach digests food.
3. For question 14: Tissues in the human body are defined as groups of specialized similar cells that work together to perform a specific function. Blood is a tissue itself, nerves are part of nervous tissue, and organs are made of tissues.

Answer:

1. B. A structure composed of a number of tissues that work together to perform a specific task
2. C. The kidneys
3. D. Cells