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Ectotherms Regulation• Many ectotherms hide from
predators at night because they are sluggish from lack of heat energy• Others prey at night (mostly in
hot climates) and stay out of extreme temperatures during the day
Ectotherm Regulation
• Ectotherms can also change color to help regulate their body temperatures.• Darker colors absorb heat while
lighter colors reflect heat.
Review• 1.What is the distinguishing feature of
ectohterms?–They regulate their internal
temperature using the sun’s energy• 2. Why is cold-blooded a cinfusing
term to describe ectotherms?–Many ectotherms have warmer
internal temperatures that endotherms.
Review
• 3. Which organisms have an easier time regulating their body temperatures, ectotherms that live on land or water? Why?–Those that live in water–Because water temperature is not
as volatile as air temperature.
Review
• 4. What are some ways that ectotherms regulate their body temperatures?–Basking, burying, changing
color
Reptiles
• Over 7000 species of reptiles• The study of reptiles and
amphibians is herpetology• Herpo in Greek is “to creep or
crawl”• All reptiles have lungs and scaly
skin
Reptiles
• Most reptiles shed their entire skin at once rather than one cell at a time like us!
Reptiles
• Scales protect the skin underneath from drying out• Retiles have bone skeletons and
most have teeth• Their teeth range from blunt
crushing teeth to thin needle-like fangs
Reptiles
•Many reptiles have a muscular, flexible, sticky tongue for catching insects.
Reptiles• Reptiles generally have well
developed organs. (snakes are deaf and some lizards don’t have eyes)• Crocodiles and alligators have
very advanced organ systems that have allowed them to thrive for millions of years.
Reptiles
• All reptiles reproduce through internal fertilization• Some lay leathery eggs and the
young are hatched • Others store their eggs inside their
bodies and the young are born live
Live birth
Reptiles
• Young reptiles look like miniature adults• Most reptile mothers do not take
care of their young
Common Reptile Groups
• 1. Turtles• 2. Lizards• 3. Snakes• 4. Alligators and Crocodiles
Turtles
• Turtles’ bodies are protected by a shell formed of plates of bone• Some shells can support a weight
200 X their own!
Turtles
Turtles• Turtles are toothless, but have a
beaklike structure to eat plants and animals