alveolar type I cells
simple squamous epithelial cells to promote rapid diffusion of gases
alveolar type II cells
almost cuboidal in shape and produces pulmonary surfactant.
(dust cells) engulfs any microorganism.
- visceral pleura- tightly adheres to the outside of the lung.
- parietal pleura- lines the pleural cavity itself
- pleural cavity- the space between these 2 layers
accessory digestive organs
teeth, tongue, salivary glands, liver, gall bladder, pancreas.
movement of the digestive system is called...
- segmentation- is a mixing motion while its moving forward
- peristalsis- just the movement or wave of contraction to move the crap forward
- 3 pairs of salvitary glands
- 1)parotid gland
- 2) submandibular gland
- 3)sublingual gland
- saliva works to kill bacteria, chemical digestion (even though most of this happens in the small intestine) moistens and cleans and lubricates.
secrete mucin which forms mucus upon hydration.
secretes a watery fluid containing ions, lysozyme and salivary amylase.
wall of the GI tract starting from the inside out
mucosa, submucosa, muscularis, serosa.
creates chyme as it continues the digestive tracts mechanical and chemical digestion.
secretes pepsinogen (brakes down protein)
secretes HCl and intrinsic factor
- has both endocrine and exocrine functions
- exocrine functions involve secreting digestive enzymes and BICARBONATE collectively called pancretic enzyme.