The Circulatory System
What is the main function of the circulatory system?
→ To transport oxygen, nutrients, and waste through the body.
What job does a valve have in the circulatory system?
→ It ensures blood flows in only one direction.
What part of the cell controls all activities?
→ The nucleus.
What is diffusion?
→ The movement of molecules from high concentration to low concentration.
What is homeostasis?
→ The ability of an organism to maintain stable internal conditions.
How many chambers does the human heart have?
→ Four.
What is the liquid part of the blood called?
→ Plasma.
Which part of the cell allows water and nutrients to enter and exit?
→ The cell membrane.
What is osmosis?
→ The movement of water through a membrane from an area of more water to less water.
Which body system helps control body temperature?
→ The skin (integumentary) system.
Which side of the heart pumps oxygen-rich blood to the body?
→ The left side.
What gas does the blood carry to the lungs to be breathed out?
→ Carbon dioxide.
What organelle is found only in plant cells and makes food?
→ The chloroplast.
Why do you smell cookies baking from another room?
→ Because of diffusion of scent molecules through the air.
What is an example of your body maintaining homeostasis?
→ Sweating when hot or shivering when cold.
What is the largest artery in the body?
→ The aorta.
How big is the human heart?
→ The size of your fist.
What structure stores water and nutrients in a plant cell?
→ The vacuole.
What would happen to a carrot in very salty water?
→ It would lose water and become soft.
What happens when you feel thirsty?
→ Your body signals that it needs more water to maintain balance.
What are the three main types of blood vessels?
→ Arteries, veins, and capillaries.
What happens to your heart when you exercise?
→ It beats faster to pump more oxygen to your muscles.
What organelle provides energy for the cell?
→ The mitochondria.
How are diffusion and osmosis similar?
→ Both move molecules from areas of higher concentration to lower concentration.
Why is homeostasis important for living things?
→ It helps organisms survive in changing environments.