10_Form_&_Funct - Introduction to Animal Form and...

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

View Full Document Right Arrow Icon
1 Introduction to Animal Form and Function © 2006: D. Julian Home Page Convergent evolution © 2006: D. Julian Natural selection shapes the form and function of animals. With a common selective pressure, similar “solutions” can result. Exchange with the external environment (1) Campbel and Reece, Fig. 40.3 Small animals achieve gas, nutrient and waste exchange without transport mechanisms and with simple body surfaces. © 2006: D. Julian
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Exchange with the external environment (2) Larger animals require more complex transport mechanisms and body surfaces to achieve adequate gas, nutrient and waste exchange. The digestive system, respiratory system (lungs or gills), excretory system (kidneys) and cardiovascular system (heart and blood vessels) all provide increased exchange with the external environment. © 2006: D. Julian Campbel and Reece, Fig. 40.3 Animals are constructed from four tissues 1. Epithelial tissue Covers the lumenal surface of hollow organs and tubes, and the external surface of the body
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 / 7

10_Form_&_Funct - Introduction to Animal Form and...

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