Exam 2 Flashcards
First and second cell division
~30 hours after conception. second on Day 2
Germinal stage
First 2 weeks, there is a zygote (initially splits, then differentiates into different body structures)
Embryonic Stage
2-8th week, embryo forms where zygote’s outer part attacehs to the uterine wall
- starting to form the placenta
- during this stage there is a possibility of zygote getting stuck in fallopian tubes which is life-threatening
- this is also where hormones are released in which the fetus responds to generate sex organs for boys
Fetal Stage
8th week to birth, Fetus
Placenta
Transfers nutrients, oxygen, antibodies, and hormones from the mother to the the fetus
Placenta protection function
Forms a barrier (placental barrier) that filters out harmful substances called teratogens, ex. medications, drugs, chemicals, alcohol (however some teratogens like alcohol are unfilterable exceptions)
- Prohibits blood transfusion between mother and fetus
Infancy
Newborn to toddler (0-3 years old)
Childhood
Toddler (3) to teenager
Primitive newborn reflexes
Rooting, sucking, and moro reflexes help aid in survival of newborn
Rooting reflex
Turns head towards gentle touch
Sucking reflex
Instinctively sucks on anything that touches the roof of their mouth
Moro reflex
Pre-evolutionary times, also known as startle reaction or embrace reflex, if baby falls downward it reaches arms out as if to be caught or grabbed
Brain development
- Brain cells are present before birth
- Neural network development: 3-6 frontal lobe (rational planning), 6 to puberty association areas performs complex cognitive processes and memories form and planning occurs etc.
Motor ability
First infants roll over, 6 months they sit unsupported, 8-9 months they begin crawling, 12 months beginning to walk, 15 months walking independently
Piagets stage theory
Sensorimotor stage (0-2 years), pre-operational stage (2-6/7), concrete operational (7-11), formal operational (12)
Sensorimotor stage
Infants learn about world through senses and actions, - tasting and touching everything
- object permanence (8 months) objects don’t disappear and are always there
Stranger anxiety (7-8 months) infants differentiate between family and strangers, important against predators
Preoperational stage
Memory and language develops, rely on intuition rather than logical reasoning
- Egocentric: cannot see what another person sees from their perspective
- Lacks ability of conservation: knowledge of mass, volume, and number remain same despite changes in form or shape
Concrete operational
Kids start to understand logic and reason
- Identity
- Acquire ability of conservation, comparison, and categorization
- Mathematical transformation
Formal operational
Reasoning ability expands from concrete to abstract thinking, use symbols and imagined realities
- think in full logic
Temperament
Easy: calm, cheerful adaptation to new situations
Difficult: intense negative reactions to unexpected events and slow to adjust to change
Slow-to-warm-up: mild negative reactions to new events, gradually adapt to new situations with repeated exposure
- emotional aspect of personality
Imprinting
Occurs only in species where newborns are able to move from birth (not humans)