An introduction to human body

Genes represent the segments of DNA that provide the chemical code for producing proteins. Evolution does not change any single individual.

The beginnings of agriculture and the rise of the first civilizations occurred within the past 12, years. Information contained in the DNA can change by a process known as mutation. Species of modern humans populated many parts of the world much later.

They seek to discover how evolution has shaped the potentials, tendencies, and limitations of all people. The human body has four limbs two arms and two legsa head and a neck which connect to the torso. For many people, paleoanthropology is an exciting scientific field because it investigates the origin, over millions An introduction to human body years, of the universal and defining traits of our species.

Introduction to Human Evolution

As a result, the offspring inherit those genetic characteristics that enhance their chances of survival and ability to give birth, which may work well until the environment changes.

From here, the blood is pumped into the lungs where it receives oxygen and drains back into the left side of the heart. They are then found either on the surface exposed by rain, rivers, and wind erosion or by digging in the ground.

Usually, the remains were buried and preserved naturally. The way particular genes are expressed — that is, how they influence the body or behavior of an organism -- can also change. Here blood passes from small arteries into capillariesthen small veins and the process begins again.

Human evolution took place as new genetic variations in early ancestor populations favored new abilities to adapt to environmental change and so altered the human way of life.

In animals that reproduce sexually, including humans, the term species refers to a group whose adult members regularly interbreed, resulting in fertile offspring -- that is, offspring themselves capable of reproducing. Many early human species -- certainly the majority of them — left no living descendants.

Parents pass adaptive genetic changes to their offspring, and ultimately these changes become common throughout a population.

Nevertheless, many people have come to reconcile their beliefs with the scientific evidence. Rick Potts provides a video short introduction to some of the evidence for human evolutionin the form of fossils and artifacts. Evolution occurs when there is change in the genetic material -- the chemical molecule, DNA -- which is inherited from the parents, and especially in the proportions of different genes in a population.

They entered Europe somewhat later, between 1. The spine at the back of the skeleton contains the flexible vertebral column which surrounds the spinal cordwhich is a collection of nerve fibres connecting the brain to the rest of the body. Scientists also debate over how to identify and classify particular species of early humans, and about what factors influenced the evolution and extinction of each species.

Paleoanthropology is a subfield of anthropology, the study of human culture, society, and biology. However, some people find the concept of human evolution troubling because it can seem not to fit with religious and other traditional beliefs about how people, other living things, and the world came to be.

Archeological evidence refers to the things earlier people made and the places where scientists find them.This exceptional resource offers a broad review of the structure and function of the human body.

Introduction to the Human Body, 10th Edition

Each chapter is dedicated to a particular organ system, providing medical and allied health students and professionals with quick and comprehensive coverage of anatomy and physiology. Features: All concepts are reinforced by detailed overviews 4/5(3).

Start studying Introduction to the Human Body - Anatomy & Physiology. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Welcome to the Web site for Introduction to the Human Body, 10th Edition by Gerard J. Tortora. This Web site gives you access to the rich tools and resources available for this text. You can access these resources in two ways. Introduction to the Human Body / Edition 9 The 9 th edition of Tortora's Introduction to the Human Body 8e provides basic content, focused design, and relevant connections about the essentials of anatomy and physiology.

Online shopping from a great selection at Books Store. Introduction to the Human Body 10 th Edition offers a balanced introduction to the human body, especially developed to meet the needs of the one-semester A&P course. It provides an effective blend of stunning art and clearly written text to illuminate the complexities of the human body.

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An introduction to human body
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