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Ch. 7 - The Endocrine System and Reproduction
Transcript of Ch. 7 - The Endocrine System and Reproduction
7.1 - The Endocrine System
Produces chemicals that control many of the body's daily activities, also regulates growth and development.
7.3 - The Human Life Cycle
When does human development begin?
Made up of a system of glands that produce and release specific chemicals.
How are glands like sweat glands different from endocrine glands?
The chemical product of an endocrine gland that gets released into the blood stream.
Hormones are chemical messengers that turn on/off, speed up, or slow down activities within the body.
Hormone production can be triggered by the brain or sometimes other endocrine glands.
Hormones usually cause a slower but longer lasting response than your nerves do.
Hormones are only recognized by target cells, each hormone has a specific target cell like a lock and key.
Functions of the Endocrine Gland
- links the nervous and endocrine systems, produces hormones that control other endocrine glands and organs
- communicates with hypothalamus to control body activities, also produces growth hormones
the system is turned off by the condition it produces
Why is this important?
Development Before Birth
- fertilized egg
- from the two-cell stage to through the eighth week of development
- from the ninth week of development until birth
Protection and Nourishment
- membrane bound, fluid filled sac that surrounds the embryo
- link between the mother and the embryo, the embryo's blood vessels are located next to the mother's blood vessels
- ropelike structure that forms between the fetus and the placenta
There is a thin barrier between the fetus and the mother, however substances like alcohol and chemicals in drugs and tobacco smoke can pass through.
- strong contractions of the uterus which cause the cervix to enlarge, 2-20 hours
- baby is pushed out through the vagina head first, umbilical cord is cut, about an hour
- about 15 minutes after delivery the uterus continues to contract and push the placenta and other membranes out through the vagina, less than 1 hour
Two types of twins:
- develop from a single fertilized egg
- two eggs are released from the ovary and fertilized by two different sperm
Growth and Development
- first two years of life
head is 1/4 of body when born
3 months - hold up head, 7 months - crawl, 10 months - walking
- from 2 - about 9
become more coordinated, increased curiosity and mental ability
- stage of development at which children become adults physically and mental
able to think like adults and take on adult responsibilities
is the period of sexual development in which the body becomes able to reproduce
- after the age of about 30 the process of aging begins, this can be slowed with diet and exercise