Ch. 2 and 3 study Flashcards
What are many unicellular organisms called?
micro-organisms
What do unicellular organisms do?
obtain food and get rid of excess waste
What are specialized to carry out specific functions?
cells
What type of cell with thick cell walls provide support and strength?
plant cell
What allows movement of cells?
cilia
What type of blood cell can carry oxygen to all the cells of the body?
red blood cells
What type of blood cell can engulf invaders?
white blood cells
What move into a cell and waste is removed from a cell through a cell membrane?
nutrients
is several smaller cells more efficient than one large cell? If true, why?
true
cells in the human body are organized into what?
tissues
What are three types of tissues that are found throughout the body?
nerve, muscle and blood
True or false. The cells in tissues are all alike or very similar and have the same function.
true
groups of tissues are organized into organs. What are groups of organs referred to?
organ systems
give 3 examples of organs that have one or more types of tissue?
heart, kidneys, lungs
name the 6 systems that are composed of different organs that have related functions>
the circulatory, nervous, excretory, digestive, respiratory, and endocrine systems
true or false. Some diseases are caused when cells are invaded by microscopic living things.
true
What do some micro-organisms, such as bacteria, protists and fungi cause in humans?
illnesses and diseases in humans
Which is a living NOT a living organisms but also cause diseases and illness by invading cells?
viruses
What depends on how well your systems work together?
your health
what is designed to protect the body against invaders?
White blood cells and antibodies.
What involves modifying the genetic material of an organism to improve the organism or to make helpful products?
genetic engineering
what are the two main types of systems that animals have
those that obtain and use nutrients and remove waste and those that control the functions of the body
what does the respiratory system do
absorbs oxygen and gets rid of carbon dioxide
what system distributes blood containing oxygen and nutrients
circulatory system
what organs get rid of waste and regulate the amount of water in the body
kidneys
true or false. different parts of the digestive system and other organs play special roles in the digestion of food
true
what system transmits messages throughout the body
the nervous system
what sends messages to the brain
sensory neurons
what carries messages from the brain to muscles
motor neurons
what 2 systems regulate what goes on inside the body
nervous system and endocrine system
what systems cannot function properly with other systems
animal systems
which system brings in oxygen and which system distributes it around the body
respiratory system; circulatory system
when cells produce waste that diffuses into the blood stream it’s filtered out by what organ
filtered out by the kidneys then eliminated from the body
what system breaks down food
digestive system
what system distributes the nutrients around the body
circulatory system
do humans have a natural system that protects them from foreign invaders
yes
name 3 physical barriers that keep invaders out of the human body
skin, mucus and ear wax
what is the role of special white blood cells
engulf and destroy invaders
what does the immune system produce and destroy
immune system produces antibodies that destroy invaders
