Ch 3: The Epithelium

Question 1

Overview of Germ Layers:

Answer 1

• Fertilized Egg divides many times to produce many small cells.
• These cells arrange themselves into three germ layers
  
  • Ectoderm
  • Mesoderm
  • Endoderm
• These germ layers then differentiate into various kinds of tissues.

Question 2

Ectoderm Gives Rise to:

Answer 2

• Epidermis, glands on skin, some cranial bones, pituitary and adrenal medulla, the nervous system, the mouth between cheek and gums, the anus.
• Skin cells.
• Neurons
• Pigment Cell

Question 3

Mesoderm gives rise to:

Answer 3

• Connective tissues proper, bone, cartilage, blood, endothelium of blood vessels, muscle synovial membranes, serous membranes lining body cavities, kidneys, lining of gonads.
• Cardiac muscle
• Skeletal muscle
• Tubule cell of kidney
• Red blood cells
• Smooth muscle

Question 4

Endoderm Gives Rise to:

Answer 4

-Lining of airways and digestive system except the mouth and distal part of the digestive system (rectum and anal canal); glands (digestive glands, endocrine glands, adrenal cortex).
- Lung cell
- Thyroid cell
- Pancreatic cell

Question 5

Overview of Tissues:

Answer 5

-A tissue is defined as a group of cells of common origin that perform a common function
- Tissues are building blocks of organs.
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