Class Notes (811,179)
Canada (494,542)
Biology (Sci) (2,418)
BIOL 111 (283)
Multiple (19)

October 16.doc

5 Pages
Unlock Document

McGill University
Biology (Sci)
BIOL 111

Bio 111 Alanna Houston October 16, 2007 Animal Characteristics: - Eukaryotic o True nucleus o Membrane-bound o Organelles - Heterotrophic o Different feeding o Use organic materials as energy and carbon source o Bring food in by ingestion o Filter feeders, predators, herbivores, parasites, detritivores o Anaerobic, or aerobic respiration o Use ATP for energy and make other organic molecules o Other groups have heterotrophic members: fungi and protozoans o Groups lacking a cell wall: protozoans (so that they can endosymbiosis) - No Cell Walls o Animals support themselves by a) hydrostatic skeleton – fluid filled cavity acted upon by muscles b) exoskeleton – external, non-living covering that does not grow with animal (ecdysozoans – molting animals) c) endoskeleton – internal support, vertebrates (living tissue), some invertebrates (non-living CaCO3 – add extra bone to the outside) - Motile at some life stage o Example: barnacle (an arthropod) – an exoskeleton sort of and living inside is an arthropod that is a filter feeder (sessile) They bring out appendages and filter feeds and then close to conserve water in low tide. Challenge for food sources and reproduction. Important in larvae to settle in an area that is good (firm substrate, stable conditions, high food source, water upwellings etc) - Multicellular o Disadvantages: lots of cell division, energetically costly, longer time to maturity therefore greater chance of dying o Advantages: more specialization, more diverse functions (examples: ciliated vs. non-ciliated cells in the lining of respiratory tract), cells can remain small even in large organisms o The greatest factor in determining cell size is the amount of surface area relative to volume (surface area / volume). Bigger cells have a smaller s.a./v whereas the s.a/v ratio of the smaller one is much bigger. The surface area is important for absorption (oxygen, nutrients, ridding of Bio 111 Alanna Houston wastes and CO2) Also, materials can diffuse throughout smaller cells more quickly o SA relative to volume: decreases as cells get larger, O2 and nutrients cannot get to whole cell - Have tissues: o Nervous, epithelial, muscular, and connective tissues o Nervous: conducts impulses (structures of cells are characteristics of tissue functions) o Epithelial: covers on outside or inside o Muscular: certain proteins that contract (shorten and lengthen) o Connective: living cells living in a non-living external matrix (example: cartilage) o Tissues: groups
More Less

Related notes for BIOL 111

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.