4.5 Extracellular Junctions, Glands, and Membranes

Question 1

Junctions

Answer 1

• Junction between cells help cells function as a tissue
• Tight, Gap, Adhesion (Desmosome)

Question 2

Tight Junction

Answer 2

• plasma membrane protein join, forming impermeable barrier; ex: urine in kidney tubules

Question 3

Gap Junction

Answer 3

Two adjacent plasma membrane channels join, allowing substances to pass between the two cells

Question 4

Adhesion Junction

Answer 4

• desmosome
• adjacent plasma membranes held together by extracellular filaments; keeps cervix from ripping

Question 5

Glands

Answer 5

1 or more cells that produce and secrete a product; most composed primarily of epithelium
- Exocrine
- Endocrine

Question 6

Exocrine Glands

Answer 6

Secrete their product onto the outer surface or into a cavity, ex: goblet cells and sweat glands

Question 7

Endocrine Glands

Answer 7

ductless and secrete their product internally to be transported by the bloodstream, ex: pituitary and thyroid glands