Active Transport

1
Active Transport

• Requires Energy

2
Active Transport

• AT Carrier Proteins
• Sodium-Potassium Pump
• Endocytosis
• Pinocytosis
• Phagocytosis
• Exocytosis

3
Active Transport

• Movement of materials against the concentration
  gradient
• Requires a cell to expend energy.

http//old.jccc.net/pdecell/cells/activean.gif
4
Cell membrane pumps

• AT Carrier proteins or cell membrane pumps
• binds to molecule (using energy)
• Shields molecule
• Released to other side

5
http//www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/
part2/images/carrier.gif
6
Sodium-Potassium Pump

• Transports Na and K ions against concentration
  gradient.

7
http//www.cat.cc.md.us/courses/bio141/lecguide/un
it1/eustruct/images/sppump.gif
8

• intro.bio.umb.edu/.../neuro_anims/
  a_p_anim1/WW3.htm

9
Endocytosis

• Endocytosis- ingest external particles.
• Macromolecules
• food particles
• 2 types
• Pinocytosis
• Phagocytosis

www.sirinet.net/jgjohnso/ homeostasis.html
10
Pinocytosis

• Pinocytosis- transports solutes or fluids

www.cat.cc.md.us/.../lecguide/ unit1/eustruct/pino
cyt.html
11
Phagocytosis

• Phagocytosis- movement of large particles or
  whole cells.
• Many organisms feed by phagocytosis.

www.cat.cc.md.us/.../lecguide/ unit2/innate/endopr
r.html
12
Phagocyte cells

• Phagocyte cells in animals ingest bacteria and
  viruses.
• Ingested into cell
• Fuse with lysosomes
• Lysosomal enzymes destroy bacteria and viruses

13
Exocytosis

• Exocytosis expels materials

14
Exocytosis

• Vesicles in cytoplasm fuse with cell membrane.
• Release contents into cells external
  environment.

www.cat.cc.md.us/.../lecguide/ unit2/viruses/relex
o.html