Lesson 6.3

Terms:

•Fertilization – merging of two sex cell-male spermatozoon and female ovum (egg).

•Ovulation –hormones stimulate an ovum to ripen and separate itself from the ovary at regular intervals.

Lesson 6.3 •Fertilization – merging of two sex cell-male spermatozoon and female ovum (egg).•Ovulation –hormones stimulate an ovum to ripen and separate itself from the ovary at regular intervals.

•Fallopian tube – tube ovum (egg cell) travels down to the uterus.

What happens to the Ovum?

One of Two things can happen:

1. If the ovum is not fertilized it will be shed along with the lining of the uterus.

or

What happens to the Ovum?

One of two things can happen:

1. If the ovum is not fertilized it will be shed along with the lining of the uterus.

or

2. If the ovum is fertilized it will attach it self to the uterus and the embryo will begin to develop.

If the ovum is fertilized it will attach it self to the uterus and the embryo will begin to develop.

If the ovum attaches a pregnancy begins.

Now sit and listen and look for a few minutes! You don’t have to write!!

Weeks One through FourGender is determined

Neural tube forms - It will develop into the nervous system (Brain, spinal cord, hair, and skin). Already your baby has the foundation for thought, senses, feeling, and more!

Heart and primitive circulatory system rapidly form - While still in its beginning stages, this is the very life support system that will carry your child throughout his or her life.

 

Week Five First heartbeats begin

Umbilical cord develops

Blood is now pumping

Most other organs begin to develop

Arm and leg buds appear [

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Week SixThe arms and legs continue to develop -

Brain is growing well -Lenses of the eyes appear -

Nostrils are formed- Intestines grow -

Pancreas - now equipped to deal with digestive enzymes and take on processing the insulin and glucagons the body

needs to function.

Week SevenElbows form

Fingers start to develop

Feet start to appear with tiny notches for the toes

Ears eyes and nose start to appear Intestines start to form

Teeth begin to develop under the gums

•Week Eight•Cartilage and bones begin to form -•The basic structure of the eye is well underway -•The tongue begins to develop •Intestines move out of the umbilical cord into the abdomen. •Body grows and makes room - Two months along and this little one is growing inside and out by leaps and bounds! •The fingers and toes have appeared but are webbed and short •Baby's length (crown to rump) is 0.61 inch (1.6cm) and weight is 0.04 ounce (1gm)

Week Nine• Baby has begun movement• Most joints are formed now

• Fetus will curve its fingers around an object placed in the palm of its hand

• Fingerprints are already evident in the skin • Average size this week -- length 0.9 inch

(2.3cm), weight 0.07 ounce (2gm)

Week Ten• Baby is now called a fetus

• The most critical part of the infant's development is complete.

• Eyelids fuse shut and irises begin to develop - Eye color is also determined by this

point.

Write this down: •Placenta begins to

function at 10 – 11 weeks The placenta is the organ responsible for both the

provision of nutrients along with the removal of waste.

Week Eleven• Nearly all structures and organs

are formed. • Fingers and toes have separated

• Hair and nails begin to grow

• Amniotic fluid begins to accumulate as the kidneys begin

to function

• The muscles in the intestinal walls begin to practice

contractions that digest food.

Week Twelve

• Vocal cords begin to form • Ears shift to their normal place on the side of

the head •Intestines move farther in to your child's body

•His or her liver begins to function • The pancreas begins to produce insulin

Back to writing!! The point is:

By the twelve week of development every detail of a person’s basic structures are developed.

The baby has brain activity and responds to touch by the 7th wk.

Back to terms:

•Gestation period – the period between fertilization and birth.

Gestation period for humans is 38 – 40 weeks.

Umbilical cord - the bundle of three blood vessels that attaches the baby to the mother’s placenta.•Has two blood vessels bringing nutrients and oxygen to the fetus

•Has one blood vessel carries waste and carbon dioxide from the baby

More about the umbilical cord:• Has two blood vessels bringing nutrients and oxygen to the fetus• Has one blood vessel carries waste and carbon dioxide from the baby

•exchange of waste and nutrients such as O2 happens at the placenta, but the mother and baby’s blood never mixes.

•Amniotic sac – is a fluid filled sac that protects the developing baby during gestation.

•Abortion – the killing of an unborn child.

•Abortion – the killing of an unborn child.

Legal in the United States since 1973.

Estimated 30 – 60 million worldwide per year

1.2 million in US/year – mostly white females 20 – 24 years of age

Legal up to 22-24 weeks gestation (after that fetus is considered viable)

Exceptions due to disabilities or life threatening to mother

Types of abortions: suction method (most common) dilation and curettage (D&C), dilation and evacuation(D&E), saline abortion, hysterotomy, and partial birth ( banned in 2003 in US. Under President GW Bush)

Partial Birth:

Banned in 2003