Ch 8 Flashcards
What are the two changes that puberty consist of that mark the change from childhood to young adulthood?
- dramatic increases in height, weight, and body fat distribution
- changes in the reproductive organs that mark sexual maturity
How much weight do females and males gain during puberty?
- females 20 pounds per year
- males 25 pounds per year
How long do girls being puberty before boys?
2 years
What age do girls typically start their growth spurt and when does it end?
- start at around age 11
- typically end at 15 but it last 4 years after they start
What age do boys typically start their growth spurt and when does it end?
- begin around 13
- and ends around 17
organs of reproduction
primary sex characteristics
denote physical signs of maturity that are not directly linked to reproduction
secondary sex characteristics
onset of menstruation in girls
menarche
First period are usually what?
irregular and without ovulation
the first spontaneous ejaculation of sperm-containing fluid
spermarche
First ejaculations usually contain few sperm, how long until there is enough sperm to fertilize an egg?
months or years
How are growth hormones trigerred?
the hypothalamus produces hormones to the pituitary gland
How does estrogen in girls and testosterone in boys produce?
the pituitary stimulates other glands
The timing of puberty is genetically regulated and is affected by what?
health and nutrition, you cannot hit puberty until you have a certain level of fat
In countries where nutrition and health care are better what occurs earlier?
menarche
What is the psychological impact of body image?
- teenagers are very attentive to physical changes, which take place very rapidly and are dramatic
- girls are more critical of their appearance and are likely to be dissatisfied while boys are more likely to be pleased
During the first period what are girls pleased by and dissatisfied by? How do they react to it?
they are pleased that they started but upset about the messiness they usually share the news with mothers and friends right away
How do boys react to hitting puberty?
They are usually more pleased if they know about it beforehand but they rarely tell their parents and friends
What may have significant consequences for adolescents?
the rate of maturation
What usually benefits boys but not girls?
early maturation
What are the feelings of boys and girls about early maturation?
- boys tend to have more positive feelings
- girls tend to have negative feelings