Homeostasis and cell transport
Answer key
1. How does the cell membrane help maintain Homeostasis?
A. Help to absorb glucose from digested food
B. Helps regulate and slow down the flow of water into cells - answer
C. It takes lower energy reactants and changes them into higher energy products
D. Convert biochemical energy from nutrients then release waste products
Answer Explanation: Homeostasis is the state of steady internal conditions maintained by living things. The cell membrane is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm from its surrounding environment. The cell membrane regulates the passage of materials in and out of the cell. In order for any materials to go in or out of the cell, they must cross through the cell's membrane.
2. What conditions should your body maintain?
A.Temperature, water, and oxygen
B. Temperature, oxygen, and osmosis
C. Temperature, hypothalamus, and oxygen
D. Temperature, water, glucose, and oxygen - answer
Answer Explanation: Homeostasis regulates and maintains internal conditions such as temperature, glucose, water, and oxygen. When your body temperature rises, receptors in the skin and the hypothalamus sense the temperature change and respond to it. When your blood sugar levels rise after a meal your pancreas releases insulin. Water carries toxins that have been made water-soluble out of the body. Water removes heat from the body when a person sweats, which helps the person regulate body temperature.
3. What is Osmosis an example of?
A.Active Transport
B. Negative Feedback
C. Passive Transport - answer
D.Positive feedback
Answer Explanation: Passive Transport does not require energy. Osmosis is the process in which water molecules move from a region of higher water potential to a lower region, so little to no energy is required.
4. You are standing outside and the temperature is very cold, so you start to shiver. Explain why you are shivering.
Answer Explanation: You begin to shiver because tiny sensors in your skin send messages to your brain telling you that you need to warm up. Your body begins to maintain homeostasis by warming up. This is considered a negative feedback loop.
5. If a scent is sprayed in a room how is it that others are able to smell it too?
Answer Explanation: Others are able to smell it because of diffusion. Diffusion is the process by which atoms or molecules move from an area of high concentration to low concentration. You can smell perfume because it diffuses into the air