Lec1 Introduction

Lec1 Introduction - Welcome to Human Biology Readings:...

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Welcome to Human Biology
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Readings: Mader 10 th edition Chapter 1
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Why study Human Biology? To understand our bodies To become knowledgeable citizens
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What is Human Biology? Study of: How our bodies work Physiology & Genetics How Humans fit in with the rest of the Biological World Evolution & Ecology
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Humans Are Part of the Biosphere All living organisms are composed of cells Organisms are collection of organ systems All organisms +physical environment = ecosystems Biosphere = global ecosystem
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Fig. 1.2
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Like All Animals: Our bodies are made of cells Humans are highly organized; energy is required to maintain organization Our bodies show metabolism: anabolism=building up; catabolism = breaking down Guiding principle in organization is to attain homeostasis Humans show irritability: ability to respond to stimuli Reproduce offspring Growth and development Evolutionary history through which organisms change over time
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All Organisms Must Eat
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Humans Reproduce and Grow
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Humans Belong to the Animal Kingdom
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Humans are Vertebrates of Class Mammalia -Common features -Common Ancestors
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How do we classify humans? Human House cat Domain Eukarya Eukarya Kingdom Animalia Animalia Phylum Chordata Chordata Class Mammalia Mammalia Order Primates Carnivora Family Hominidae Felidae Genus Homo Felis Species sapiens domesticus
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Humans Are the Result of an Evolutionary Process Humans are the way they are because of many millennia of “natural selection” Subject to same biological principles as all other organisms
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What distinguishes humans? Cultural heritage or patterns of our behavior passed from one generation to the next Language skills Varied tool use Well-developed brains Upright stance How humans interact with biosphere and each other strongly influenced by cultural, religious customs and practices as well as their economic activity Modification of our environment for our own purpose which may threaten the biosphere
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Health and Homeostasis Homeostatic mechanisms keep conditions within certain defined limits Vital for survival and reproduction These mechanisms may act at the level of the cell or even at whole ecosystems When these mechanisms break down illnesses may result (if in the body) or ecological catastrophes can occur (if in the world at large)
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Lec1 Introduction - Welcome to Human Biology Readings:...

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