Skeletal
How many bones are in the adult human body?
206 bones.
What is the main function of muscles in the body?
To help the body move.
What organ is the main control center of the nervous system?
The brain.
What is the first organ where digestion begins?
The mouth.
What gas do humans need to breathe in to survive?
Oxygen.
What are the main functions of the skeleton?
Protection and Support
What type of muscle is attached to bones and helps us move voluntarily?
Skeletal muscle.
What are the specialized cells that send messages through the nervous system?
Neurons (nerve cells).
What organ mixes food with strong acids and digestive juices?
The stomach.
What two main organs are responsible for breathing?
The lungs.
What is the name of the place where two bones meet?
A joint.
Which muscle pumps blood throughout the body?
The heart (cardiac muscle).
What do we call a quick, automatic reaction to a stimulus, like pulling your hand away from something hot?
A reflex.
Which part of the digestive system absorbs most nutrients from food?
The small intestine.
What tiny air sacs in the lungs are responsible for gas exchange?
Alveoli.
Which bone protects the brain?
The skull (cranium).
What do we call muscles that work in pairs to move bones in opposite directions?
Antagonistic muscles (or muscle pairs).
What part of a neuron carries electrical signals away from the cell body?
The axon.
What muscular movement pushes food through the digestive tract?
Peristalsis.
What waste gas is removed from the body when we exhale?
Carbon dioxide.
Which part of the skeletal system produces blood cells?
Bone marrow.
Which type of muscle is found in organs like the stomach and intestines and works involuntarily?
Smooth muscle.
What is the name of the tiny gap between two neurons where chemical signals pass from one cell to another?
The synapse.
What tiny structures in the small intestine increase surface area to help absorb nutrients?
Villi.
What muscle located below the lungs helps control breathing?
The diaphragm.