1. Begins ~ 12 hours post-fertilization 2. Zygote divides into 2 cells (mitosis) 3. 46 chromosomes in zygote = 46 chromosomes in both daughter cells.

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Presentation transcript:

1. Begins ~ 12 hours post-fertilization 2. Zygote divides into 2 cells (mitosis) chromosomes in zygote = 46 chromosomes in both daughter cells 4. 2 cell into 4 cell stage (24 – 36 hours) 5. 4 cell into 8 cell stage (36 – 72 hours) cell stage -- Morula

72 hours post- fertilization entering uterus

Blastocyst has fluid-filled inner cavity Evolves from morula on day 5

Implantation continues Erosion of maternal blood vessels Complete emersion into endometrium of uterus

Development of CV and nervous systems

Embryo will develop all structures that an adult has by the end of week 8

Embryonic period is weeks 1-8 Fetal period begins on week 9 and goes until birth at 38 weeks. Embryonic period is characterized by development of structures (organs). Fetal period is characterized by growth of those structures. Chemicals produced by the embryo stop the woman's menstrual cycle.

Human Life Stages

Infancy: birth to 1 year Early childhood: 1-6 years Late childhood: 6-12 years Adolescence: years Early adulthood: years Middle adulthood: years Late adulthood: 65 years and up

Physical: body growth Mental: mind development Emotional: feelings Social: interactions and relationships with others All four types above occur in each stage

Age: birth to 1 year old Physical development– roll over, crawl, walk, grasp objects Mental development—respond to cold, hunger, and pain by crying. Begin to recognize surroundings and become aware of surroundings and people Emotional development – show anger, distrust, happiness, excitement, etc. Social development – self-centeredness concept of the newborn to recognition of others in their environment

Age: 1-6 years old Physical development – growth slower than in infancy. Muscle coordination allows the child to run, climb, move freely. Can write, draw, use a fork and knife Mental development – verbal growth progresses, short attention span, at end of stage ask questions, recognize letters, and some words Emotional development – develop self-awareness and recognize the effect they have on other people and things. Children feel impatience and frustration as they try to do things beyond their abilities. This lead to temper tantrums (the terrible two’s) Social development – at beginning of stage very self-centered one year old to sociable six year old. Strong attachment to parents. Needs are food, shelter, protection, love and security.

Age: 6-12 years old Physical development– slow but steady. Muscle coordination is well developed and children can engage in physical activity that require complex motor-sensory coordination Mental development – developing quickly and much of the child’s life centers around school. Reading and writing skills are learned, understand abstract concepts like honesty, loyalty, values and morals

Emotional development -- the child achieves greater independence and a more distinct personality. Fears are replaced by the ability to cope. Social development – changes from activities by themselves to more group oriented. They are more ready to accept the opinions of others and learn to conform to rules, and standards of behavior. Needs are the same as infancy and early childhood along with the need for reassurance, parental approval, and peer acceptance.

Age: years old Physical development – growth spurts, muscle coordination slows. Development of sexual organs and secondary sexual characteristics (puberty). Secretion of sex hormones leads to the onset of menstruation in girls and the production of sperm and semen in boys. Body shape and form changes.

Mental development – most foundations have been set. Development primarily involves an increase in knowledge and sharpening of skills. Learn to make decisions and accept responsibility for actions. Emotional development – emotional development is often stormy and in conflict. Adolescents try to establish their identities and independence. They respond more and more to peer group influences.

Social development – spending less time with family and more time with peer groups. They attempt to develop self- identity and independence and seek security from their peers. Toward the end of this stage they develop a more mature attitude and develop patterns of behavior that they associate with adult behavior.

Often develop from an excessive concern for appearance Anorexia nervosa Bulimia More common in females Usually, psychological or psychiatric help is needed to treat these conditions

Use of alcohol or drugs with the development of a physical and/or mental dependence on the chemical Can occur at any life stage, but frequently begins in adolescence Can lead to physical and mental disorders and diseases Treatment towards total rehabilitation

Trying to relieve stress or anxiety Peer pressure Escape from emotional or psychological problems Experimentation Seeking “instant gratification” Hereditary traits or cultural influences

Age: years old Physical development – basically complete. Muscles are developed, strong and motor coordination is at its peak. Mental development – young adults seek additional education, choose careers and independence.

Emotional development – Young adults are subjected to many emotional stresses related to career, marriage, family, etc. Social development – moving away from peer group, and adults tend to associate with others who have similar ambitions. Most find a mate and begin a family.

Age: years of age Conflict – Generosity vs. Stagnation Physical development – Hair grey’s and thins, skin wrinkles, muscle tone decreases, hearing loss, visual acuity losses, weight gain.  Mental development – can continue to increase. Confident decision makers and excellent at analyzing situations.

Emotional development – can be a period of contentment and satisfaction. Social development -- Family relationships can decline as children begin lives of their own and parents die. Divorce rates are high. Friendships are with people with similar interests and lifestyles.

Age: 65 years of age and up Physical development – on the decline. Skin becomes dry and wrinkles, “age spots” appear. Hair thins, muscles lose tone and strength. Memory loss can occur and reasoning ability can diminish.

Mental development – varies. People who remain mentally active and are willing to learn new things tend to show fewer signs of decreased mental ability Emotional development – Emotional stability also varies. Social development – retirement can lead to loss of self esteem, lost identity. Death of spouse and friends cause changes in social relationships.

Death is “the final stage of growth” Experienced by everyone and no one escapes Young people tend to ignore its existence Usually it is the elderly, who have lost others, who begin to think about their own death

Death is “the final stage of growth” Experienced by everyone and no one escapes Young people tend to ignore its existence Usually it is the elderly, who have lost others, who begin to think about their own death

Needs: lack of something that is required or desired Needs exist from birth to death Needs influence our behavior Needs have a priority status Maslow’s hierarchy of needs