Lect24-2008-MammalsI - Lecture 24 -Mammals-I Slide-2:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 24 -- Mammals-I Slide-2: Mammalia is a ___________________ in the Subphylum ________________ in the Phylum _______________________. Slide-3: Mammals are further subdivided into 2 Subclasses 1. The Prototherias includes the Monotremes, or __________________ - laying mammals 2. The second sub-class, Theria, includes both the pouched mammals, or ____________________ as well as the Placental mammals Slide-5: Mammalian evolution: Mammals are thought to have evolved about ____________ mya Mammals arose from reptile-like predecessors, called the ________________ since the skull had one opening. The _______________ evolved from this group and the only group to survive was the ___________________ and this group gave rise to the mammals of today. Slide-6: Mammals are ___________________ in that they can keep and use the waste heat in their body; they are __________________ in that they have a set temperature which is usually higher than the environment. The higher internal body temperature allows mammals to operate at peak efficiency and to live in a much wider range of habitats Mammals have extremely ____________ metabolisms
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Mammals are able to cool their bodies by unique cooling mechanisms: 1. _sweating_ 2. _panting_ 3 some mammals have large vascularized ears Slide-8: The one unique feature of mammals is that they have __fur__, made of keratin, and derived from the epidermis. (Birds have __feathers__; mammals have ___hair__) Slide-9: Most mammals have a double coat of fur. The __outer guard__ coat consists of guard hairs, is course in texture, and functions in protection. The __under hair__ coat consists of very dense hair and is specialized for _insulation_ . Hair can be modified such as into _vibrissae_ (whiskers), _horns_
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

Lect24-2008-MammalsI - Lecture 24 -Mammals-I Slide-2:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online