1. Other Modes of Transport: Facilitated Diffusion and Active Transport
Campbell

2. What are plasma membranes made of?

3. Membrane Structure Made mostly of phospholipids
These form a phospholipid bilayer
Phosphate group
Polar
Hydrophilic Head
Fatty Acid
Non-polar
Hydrophobic Tails

4. Large items and ions can’t cross membrane without gates!

5. Types of Membrane Transport
Simple Diffusion
Does NOT require energy
High to low concentration
Facilitated diffusion
A membrane protein is needed
Active transport
Requires energy
Low to high concentration
Passive Transport – No energy
Active Transport – requires energy

6. Passive transport

7. Types of Membrane Transport

8. Types of Transport Proteins
Non-specific transporter
Specific transporter

9. Aquaporins – facilitated diffusion - water is polar; won’t move on its own - aquaporin – pores that allow movement of water through channel protein
Review protein structure

10. How glucose enters a cell - specific glucose transporter - facilitated diffusion – High to low – no energy!
What model of protein binding is this?

11. Active Transport – requires energy

12. Sodium-Potassium Pump

13. Bulk Transport – large amounts of substances cross the membrane
Exocytosis
Endocytosis
Release to outside
Wastes, hormones, signals
Phagocytosis (eat)
Pinocytosis (drink)
Clicking animation takes you to a great illustration from the Krogh textbook – use this! I tell students to think of phago/”food” (both begin with F sound), and pino/drink (like you drink a pina colada).
Animation

14. Ex. Phagocytosis
Video clip

15. Review Qs Why is kinetic E. important to balance?
You smell smoke from a campfire across the street. Why is this diffusion but NOT osmosis?
What kinds of molecules cross the membrane most easily?
Given: 30% sucrose outside cell, 10% sucrose inside. Which is hypertonic? Which way does water move?
How does swelling affect plants and animals differently?
What process do white blood cells use to eat your body’s foreign invaders?

16. part 3

17. Arteries transport blood away from the heart.
Veins transport blood towards the heart.
Capillaries transport gasses, nutrients, and waste into and out of the blood stream.

18. Show me what would happen if this is a capillary bed in the muscle tissues of a dehydrated person.
Exchange with cells or outside environment?
Nutrients, waste, O2, CO2, H2O?

19. Form suits function

22. Transport in the circulatory system

23. Circulatory system overview

24. Two hearts in one

25. Capillaries (tissues)
Human circulation
Heart LV RA LA RV
Pulmonary circuit
Arteries
Arteries
Veins
Veins
Capillaries (lungs)
Capillaries (tissues)
Deoxygenated
Oxygenated
Systemic circuit

28. Alveoli are the site of gas exchange in the lungs.
Why so many?