IMG_NEW_0001 - Com pa rative physiology: "sca...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
ln higher animals, digestion occurs exclusivelv by extracellular means in an alimentary canal, a one-way tube running from mouth to anus. There are many structural and functional adaptations of digestive systems that are associated with the diet and lifestyle of the organism: 4. Overview: organ specialisation for sequential stages of food processing in mammal digestive system 5. Evolutionary adaptations of vertebrate digestive systems correlate with diet - dental adaptations i - carnivores = large pointed canines; jagged premolars and molars - herbivores = incisors/canines flat for cutting vegetation; other teeth have broad, ridged surfaces for grinding plant material lnsulin and glucagon = example of hormones with antagonistic function 8. Bioenergetics of an animal: Metabolic rate
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Com pa rative physiology: "sca ling" of meta bolic rate and body mass across different species (Fie. a0.19) ]rfWv,OfA- "mixed" teeth structure for eating meat + plants: 2 x bladelike incisors, canine for biting/tea ring, premolars for grinding, mola rs for crushing 5. Digestive tract adaptations: stomach and intestine 7. Homeostatic mechanisms contribute to an animal's energy budget Energy obtained from food = Energy for metabolism, activity and storage When food intake is greater than energy used, excess nutrients can be stored Muscle and liver cells = main storage sites Homeostatic mechanisms balance storage vs. utilisation e.g. glucose homeostasis (Fig. 1-21)...
View Full Document

This note was uploaded on 12/29/2011 for the course HSCI 160 taught by Professor Kreis during the Fall '10 term at Simon Fraser.

Ask a homework question - tutors are online