BIOL 111 Lecture Notes - Osmosis, Kidney Failure, Caffeine

42 views3 pages
Many reptiles are endangered due to human activities:
- over harvesting
- habitat manipulation
Birds and mammals have two separate circuits:
Reptiles (not including birds):
- Intermediary with ventricle that’s somewhat separated and 2 atria
- Some reptiles can shunt blood directly to aorta underwater
- Terrestrial
- More efficient heart, breathe only through lungs
- Most conserve water w/ water proof skin and scales made of keratin
- Shedding of skin happens in some reptile controlled by hormones
- Produce nitrogenous waste to conserve water
- Reproduce on land = internal fertilization and amniotic egg
Non-avian reptiles:
- 6000 species
- Most terrestrial
- Carnivorous, omnivorous, herbivorous
- Dry skin, scales
- First amniotes: arose in carboniferous
Amniotic egg
= egg surrounded by extra embryonic membranes: perhaps with external
- Shell: leathery/brittle (CaCO3)
- Impermeable to water
- Permeable to gases
- Not present in therian mammals
- Embryo surrounded amnion for protection
- Yolk sac produced by embryo
- Allanntois: place for storage of waste and gas exchange
- Chorion for gas exchange and water conservation
- All surrounded by albumen
Consequences of terrestrial egg:
- internal fertilization must occur:
- sperm cannot penetrate egg shell, shell and albumen are added to
the fertilized egg after fertilization
- must have non toxic nitrogenous wastes = uric acid
Excretory system:
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.