Human Body Systems
This muscular organ acts as a central pump to move oxygen-rich and nutrient-filled blood all throughout the body.
What is the heart?
This is where digestion starts with mechanical chewing and chemical enzymes in saliva
What is the mouth?
These intense eruptions of radiation from the Sun's surface can damage communications satellites and ground electrical grids.
What are solar flares?
This is the solid, unweathered foundation layer of rock sitting beneath all other soil layers
What is bedrock?
This law states that energy cannot be created out of nothing, nor can it disappear into nothing; it can only transition from one format to another
What is the Law of Conservation of Energy?
This dome-shaped sheet of muscle contracts to pull air into the lungs and relaxes to push it out
What is the diaphragm?
This muscular tube pushes food down from your mouth to your stomach
What is the oesophagus (or esophagus)?
These are solid masses naturally made up of aggregated mixtures of minerals, organic substances, volcanic glass, or chemical precipitates
What are rocks?
This thin, top layer is rich in dark, decayed organic material like leaves and bugs that feed soil life.
What is humus?
This term describes the bending of light waves when they pass at an angle from one medium to another because their speed changes.
What is refraction?
This cage of bones surrounds and shields vital internal organs like your heart and lungs from injury.
What is the rib cage?
This organ absorbs water from remaining undigested material, turning it into solid waste
What is the large intestine?
This type of tectonic boundary occurs where plates pull apart from one another, forming rifts, valleys, and mid-ocean ridges.
What is a divergent boundary?
This crumbly, dark soil layer contains a mix of organic matter and minerals, and it is where plant roots grow.
What is topsoil?
To find this value for a traveling object, you must multiply its speed by the time it was traveling.
What is distance?
These tiny, grape-like air sacs at the ends of the lung airways serve as the exact site of gas exchange
What are alveoli?
This muscular sac secretes strong gastric acids and enzymes to churn and break down proteins chemically.
What is the stomach?
This type of mechanical weathering occurs when heavy, overlying rocks are eroded away, causing the buried rock underneath to expand, crack, and peel
What is the release of pressure?
This layer consists mostly of large, weathered chunks of rock that are breaking apart to create new soil
What is parent material?
These are the three forms of energy that electrical energy transforms into when you plug in and turn on a television.
What are light (radiant), sound, and thermal (heat) energy?
These strong cords of fibrous tissue connect muscles to bones, allowing you to move when your muscles contract
What are tendons?
This long, narrow tube is where the majority of nutrient absorption occurs via tiny, finger-like projections called villi.
What is the small intestine?
At this type of tectonic boundary, plates grind horizontally past each other, creating powerful earthquakes like the San Andreas Fault.
What is a transform boundary?
This lighter soil layer accumulates clay and iron leached down from the upper horizons
What is subsoil?
This simple machine is made up of two inclined planes placed back-to-back and is used to split objects apart, like an axe
What is a wedge?