Flashcards in Exam Questions Deck (16):
Why is homeostasis important for mammals?
maintains balance. Breathing, metabolic processes, diffusion across membranes and enzyme function
Body regulates temperature. It is a homeostatic mechanism
Describe mechanisms involved with thermoregulation
Receptor, Control centre, Effector: Negative feedback. Cold: Heater turns on Hot: Heater turns off
Name the 5 types of epithelial cells
Squamous, stratified squamous, cuboidal, columnar and ciliated columnar epithelial cells
Function and of ciliated columnar
Cilia moves and pushes mucus into a layer e.g. pushes mucus along the surface of the uterus or upper respiratory tract
Function and example of cuboidal cells
Dice shaped for secretion e.g. kidney tubules and salivary glands
Function and example of squamous
Thin and leaky e.g. air sacs of the lungs
Function and example of columnar
Large cytoplasmic volume, absorbs nutrients, secretion e.g. Intestines and digestive juices
Function and example of stratified squamous
Rapidly regenerating, for places of abrasion, new cells originate from the basal side and the old cells are sloughed off e.g. Skin and lining of the oesophagus
Exocrine secretions in the stomach
Gastric juices containing enzymes, mucus and HCL and mucus cells form protective barrier
Release gastrin which stimulates the release of gastric juices: increase digestion
Exocrine secretions of the pancreas
Amylase break down polysaccharides, lipase breaks down triglycerides and enzymes digest compounds in chyme.
What is the role of bicarbonate ions released in the pancreas?
Neutralize the acidity in chyme.
What is Trypsin and where is it found?
Trypsin (active) catalyzes the activation of trypsinogen (inactive). Trypsinogen is secreted from the pancreas into the duodenum
What happens to trypsinogen in the duodenum?
Trypsin cleaves proteins at the C-terminal side of trypsinogen to create tryspin