Essentials of Anatomy and Physiology

55

A Diffusion

B Osmosis

C Facilitated Diffusion

D Active transport

E Filtration

F Phagocytosis

G Pinocytosis

Small protein

Cell of

kidney

tubule

Lysosome Bacterium

White blood cell

• • •
  
  
  • •
  
  
  
  

H 2 O

BP

Glucose

Amino

acid

RBC Capillary intissues

Cellmembrane • Na

+

Tissue fluid

ATPActive

transport

Cytoplasm channel

Diffusion

channel

• 
  

  •

  
  

Cell membrane of intestinal cell

H 2 O

Na+

Cytoplasm

• Alveolus of lung


• Capillary

O 2

O 2

O (^2) O 2
O 2
O 2
O 2
O 2
O 2
O (^2) O 2
CO (^2) CO 2 CO 2
CO 2
CO 2
CO 2

Glucose

• Transporter
  Cytoplasm

Tissue fluid

• Cell membrane

Figure 3–3. Cellular transport mechanisms. (A) Diffusion in an alveolus in the lung.
(B) Osmosis in the small intestine. (C) Facilitated diffusion in a muscle cell. (D) Active trans-
port in a muscle cell. (E) Filtration in a capillary. (F) Phagocytosis by a white blood cell.
(G) Pinocytosis by a cell of the kidney tubules. See text for description.
QUESTION:Which mechanism depends on blood pressure? Which depends on the move-
ment of a cell?