Biology
- Which Of The Following Secretes Succus Entericus?
A) Peyers patches B) Brunner's glands C) Auerbach's plexus D) Crypts of Lieberkuhn The correct answer is: D) Crypts of Lieberkuhn...
- Organs Derived From Germ Layers Of Embryo
Ectoderm Mesoderm Endoderm Skin (epidermis) and their pigment cells, hairs, nails. Connective tissues, superficial and deep fascia, ligaments, tendons, dermis of skin (from dermatotome) Epithelial part of mouth, some part of palate, tongue,...
- Excretory Organs Of Animals
Phylum Excretory organ Porifera No. Diffusion through body surface Cnidaria No. Diffusion through body surface Ctenophora No. Diffusion through body surface Platyhelminthes Protonephredia (Flame cells) Nemathelminthes Renette cells Annelida...
- Important Glands And Corpuscles
Glands/Corpuscles Location Functions 1. Accessory glands Male reproductive system Activation and lubrication of sperms 2. Accessory glands Earthworm Copulation 3. Antennary...
- Poisonous Animals
Animal Features 1. Blister beetle (Lytta vesicatoria) Canthridine (poison) causes blisters.Body hairs of certain insects have basal unicellular glands putting poison, often causing urticarial rash 2. ...
Biology
GLANDS CLASSIFICATION
Classification of glands (Based on presence or absence of ducts):
| Endocrine (ductless) glands | Exocrine (ducted) glands | ||
| 1. Hypothalamus 2. Pituitary 3. Pineal 4. Thyroid 5. Parathyroid 6. Thymus 7. Pancreas (Islets of Langerhans) 8. Adrenal 9. Gonads (Testes & Ovary) | Unicellular | Multicellular | |
| E.g. Chalice cells (Goblet cells) in the epithelial lining of the small intestine. | Simple | Compound | |
| 1. Non-coiled tubular: E.g. crypts of Lieberkuhn | 1. Tubular: E.g. Milk glands of egg-laying mammals, Brunner?s glands | ||
| 2. Coiled tubular: E.g. Sweat glands | 2. Alveolar: E.g. Mammary glands | ||
| 3. Branched tubular: E.g. Gastric glands, Brunner?s glands, Sweat glands of arm pit | 3. Tubule-alveolar: E.g. Salivary glands, pancreas | ||
| 4. Alveolar (Acinus): E.g. Mucus secreting glands in frog skin | | ||
| 5. Branched alveolar (Branched acinus): E.g. Sebaceous glands (oil glands) | |||
Classification of glands (Based on modes of secretion):
| Holocrine glands | The entire cells disintegrate to release secretions. E.g. Ceruminous glands, Sebaceous glands |
| Merocrine glands | Glands release secretions by simple diffusion (without the loss of cytoplasm). E.g. Sweat glands, Salivary glands |
| Apocrine glands | The contents and the free ends of glandular cells are pinched off during secretion. E.g. Mammary glands, certain sweat glands |
- Which Of The Following Secretes Succus Entericus?
A) Peyers patches B) Brunner's glands C) Auerbach's plexus D) Crypts of Lieberkuhn The correct answer is: D) Crypts of Lieberkuhn...
- Organs Derived From Germ Layers Of Embryo
Ectoderm Mesoderm Endoderm Skin (epidermis) and their pigment cells, hairs, nails. Connective tissues, superficial and deep fascia, ligaments, tendons, dermis of skin (from dermatotome) Epithelial part of mouth, some part of palate, tongue,...
- Excretory Organs Of Animals
Phylum Excretory organ Porifera No. Diffusion through body surface Cnidaria No. Diffusion through body surface Ctenophora No. Diffusion through body surface Platyhelminthes Protonephredia (Flame cells) Nemathelminthes Renette cells Annelida...
- Important Glands And Corpuscles
Glands/Corpuscles Location Functions 1. Accessory glands Male reproductive system Activation and lubrication of sperms 2. Accessory glands Earthworm Copulation 3. Antennary...
- Poisonous Animals
Animal Features 1. Blister beetle (Lytta vesicatoria) Canthridine (poison) causes blisters.Body hairs of certain insects have basal unicellular glands putting poison, often causing urticarial rash 2. ...