G7 U2 L1 Homeostasis

Read each sentence. Write True if it is correct. Write False if it is wrong.

1. Homeostasis helps keep the inside of the body steady, even when the outside world changes.

• true

• false

Write True if it is correct. Write False if it is wrong.

If your body gets too cold, you sweat more to cool down.

• true

• false

Read each sentence. Write True if it is correct. Write False if it is wrong.

A part of your brain called the hypothalamus controls your body's temperature.

• true

• false

4. 4. The process your body uses to keep its inside conditions steady is called ​ ​ (a)   . 5. When your body is too hot, the blood vessels in your skin get wider. This process is called ​ (b)   .

• homeostasis
• vasodilation
• effector
• vasoconstriction
• hypothalamus,

1. Which of these is the best example of homeostasis?

• • Your body stays near 37°C, even if it's hot or cold outside.

• • You grow taller as you become a teenager.

• •  A cut on your skin heals and leaves a scar.

• • You learn how to speak Spanish.

1. What is the correct order when your skin gets too cold?

• • Feel cold → brain signals → sweat more.

• • Feel cold → brain signals → shiver and skin blood vessels get smaller.

• • Feel cold → brain signals → skin blood vessels get bigger and you sweat.

• • Feel cold → brain signals → heart stops.

1. A person is running on a very hot day. What does their body do to keep cool?

    

• • Shake (shiver) and make skin blood vessels smaller.

• • Sweat and make skin blood vessels bigger.

• • Sweat and make skin blood vessels smaller.

• • Shake (shiver) and make skin blood vessels bigger.

1. A student says, “The hypothalamus in your body is like the thermostat in your house.” Why is this a good comparison?

• • They both save heat when it's cold.

• • They both make sweat to cool off.

• • They both sense if the temperature changes and turn systems on/off to fix it.

• •  They both stop the temperature from ever changing.

A patient cannot constrict or dilate skin blood vessels properly. On a very cold day, their core body temperature drops faster than normal. Which explanation best interprets why this happens?

• Normally, vasoconstriction reduces blood flow to the skin to conserve heat; without it, more heat is lost to the cold air.​

• Normally, vasodilation increases blood flow to generate more heat; without it, shivering cannot start.

• Normally, sweat glands need dilated vessels to work; without them, dehydration occurs first.

• Normally, the hypothalamus signals vessels to store heat; without them, receptors fail to detect cold.​