GoalReview the human body unit: organs, nervous system, cells, blood and a doctor’s tools.
New words
nerve cell · nerv hujayrasistethoscope · stetoskopblood-pressure meter · tonometrthermometer · termometr
Explanation
In this unit we studied the structure of our body. Inner organs (brain, heart, lungs, stomach, liver) join into systems: nervous, digestive, respiratory and circulatory. Cells differ: an erythrocyte looks like a round cushion and carries oxygen; a leukocyte is a defender; a nerve cell passes signals along its long extensions; lung cells look like tiny bubbles; muscle cells contract. An example of the nervous system: if a speck gets in the eye, sensors in the eye signal the brain, the brain commands “clean the eye”, and the tear glands release tears. A doctor’s tools: stethoscope — to hear breathing and heartbeat, thermometer — temperature, blood-pressure meter — blood pressure. A microscope is used mostly in a laboratory rather than at a check-up.
Worked examples
Order: a speck fell in the eye → nerve endings told the brain → the brain gave a command → tears flowed.
Wrong statement: “Children and adults have the same number of bones.” Correct: children have more bones; some fuse later.
Class activity
“Body systems”: groups each present one system (nervous, digestive, respiratory, circulatory) in 3 minutes with a short skit or a diagram.
Practice
1
Match cells to jobs: erythrocyte, leukocyte, nerve cell.