cells & tissues
What is the basic building block of all living things?
cells
How many bones does an adult human body have?
206 bones
Approximately how many muscles are in the human body?
650 muscles
The heart is a strong muscle that belongs to which system?
The circulatory system
What is the main function of the respiratory system?
To bring in oxygen and remove carbon dioxide
What is formed when groups of similar cells work together to perform a specific job?
a tissue
Where are blood cells produced?
In the bone marrow
What do muscle tissues do to make parts of your body move?
They contract, or shorten
What is a primary function of the circulatory system?
To bring nutrients and oxygen to cells
Where does digestion begin?
In the mouth
Muscle cells, blood cells, and nerve cells are all examples of what?
specialized cells
Which mineral is stored in the skeletal system and is needed for digestion and body function?
Calcium
Which muscle helps you breathe by contracting to inhale and relaxing to exhale?
The diaphragm
Which of these is NOT a component of the circulatory system?
What is the "clean-up crew" system that removes waste and extra stuff from the body?
The excretory system
What are the four main types of tissues in the human body?
Epithelial, connective, muscle, and nervous tissue
What is NOT a main function of the skeletal system?
Sending electrical signals to muscles
How does the muscular system help the digestive system?
By pushing food through the digestive tract
What does the circulatory system carry away from cells as waste?
Carbon dioxide
The process of keeping the body's internal environment stable and balanced is called what?
Homeostasis
An organ, such as the heart or stomach, is made of what?
Are bones dead or living structures?
Which system sends signals through nerves to tell muscles when to contract?
The nervous system
How do the kidneys interact with the circulatory system?
They filter the blood to remove waste and extra substances
Tiny air sacs in the lungs where gas exchange occurs are called what?
Alveoli