Movement of molecules in and out of cells Flashcards
Does osmosis need energy?
No it is a passive process.
What is osmosis? ( 3 marks)
The diffusion of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration
What do most sports drinks contain?
Water, ions and glucose
If you put potato chips in water would they gain or lose mass?
Gain, as water would enter by osmosis
What is active transport?
Active transport is the movement of particles against a concentration gradient using energy released during respiration
Give some examples of active transport ( 3 marks )
To absorb the last nutrients in the gut For plants to absorb minerals through root hairs To re- absorb glucose in the kidney
What makes a great exchange surface?
Thin Large surface area Good blood supply
What is the exchange surface in the lungs?
Alveoli
What are the adaptations of the alveoli? (4 marks)
Massive surface area Moist lining Thin walls ( one cell thick) Good blood supply
What is the exchange surface in the small intestine?
Villi
What is ventilation in humans?
The movement of air, into and out of the lungs.
What does an increase in volume do to pressure
It decreases
What is the name of the muscle at the bottom of the thorax?
Diaphragm
When the diaphragm contracts it ……
Flattens
What was the name of the old fashioned ventilator?
An iron lung
How do ions move into root hairs?
By active transport
What is this showing?
Ventilation - bet you said breathing in and out!! Hehehe!
