0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How many main blood vessels does the earthworm have?
2 major blood vessels
What is the role of the cells that line the capillaries of the brain?
The cells lining the brain's tiny blood vessels (capillaries) are specifically designed to prevent many substances from passing into brain tissue.
Can blood vessels make new blood vessels?
Blood vessels can form new blood vessels, this is called angiogenesis.
Why are nephrons surrounded by tiny blood vessels?
Why are nephrons surrounded by many tiny blood vessels
How many kilometers of blood vessels are in your body?
How many kilometers of blood vessels are in your body? If they could be laid end to end, the blood vessels would cover a distance of about 60,000 miles (96,500 kilometers).
How many blood vessels do earthworms have?
Earthworms have Red blood.
The female reproductive anatomy consists of many parts what correctly describes the endometrium?
The lining of cells inside the uterus
How many different blood vessels are there?
3
How many tunics do blood vessels have?
3
How many types of blood vessels are found in human body?
There are three types of blood vessels. There are veins, arteries, and capillaries.
Why do diabetes affect so many organs?
Diabetes is primarily a disease of blood vessels. Because blood vessels feed all our organs, many organs can be damaged when diabetes messes with the blood flow by damaging blood vessels. It's the constant high blood sugar in diabetics that damages blood vessels. If a diabetic keeps his blood sugar under control, it's as if he doesn't have the disease.
How would you write a basic description of the average menstrual cycle?
Females are born with two ovaries that already contain millions of eggs. These eggs will last throughout the female's reproductive years. Between ages 9 and 12, specific types of hormones (collectively called sexual characteristics hormones) begin to be released in the female's body. These hormones stimulate the breast tissue to start growing and stimulates the ovaries and uterus.For the very first cycle and all (normal) cycles thereafter, first the uterus begins to develop a thickened lining for the first 10 days at least. This thick lining has lots of small blood vessels. This is needed because if an egg is fertilized, it will implant into the tissue and the blood vessels will carry nutrients to the fetus through the placenta and umbilical cord. **Because the lining grows first, a girl can get pregnant in the month before her very first period.Next to, but not attached to the ovaries are Fallopian Tubes (one on each side) that attach to the uterus. Around the middle of the "cycle", hormones tell the ovary (only one ovary only on one side) to release an egg. For a single birth to occur, one egg must be released and fertilized. For NON-fraternal twins (they don't look alike), the ovary released 2 eggs. (If twins look exactly alike, fraternal twins, they came from one egg that split into 2 and developed into 2 fetuses.) The egg is attracted to the Fallopian tube on the side it was released on. The Tube uses hair-like structures to guide the egg into the Tube.If a girl has sex within about 72 hours surrounding when an egg is released, the optimum place in the uterus for fertilization and implantation is in the top-on a side of the uterus, near to where the Tube attaches to the uterus. An egg CAN implant lower in the uterus, but in many cases, this can cause complications for both the fetus and the mother if the egg implants really low near the cervical opening.If no egg is fertilized OR if a fertilized egg does not implant, the body has to have a way to get rid of the egg that was not fertilized or implanted AND get rid of the uterine lining. Hormones again tell the uterus that "no pregnancy occurred; let's stop the lining from building up any more". At about day 21 to day 28, the lining begins to separate from the uterine wall. This is called sloughing (pronounced "slaw-fing"), which means it slides almost painlessly away without much tado. However, all those blood vessels that kept the lining healthy are "pulled" apart from the wall, so there is bleeding. Other than uterine cramps, the girl does not experience pain from this bleeding. (Example: A cut causes pain. A friction burn causes pain. But a period just causes cramps. These crampy feelings can be severe, but not always.)As the lining pulls away, gravity helps it move the blood and small bits of tissue to the bottom of the uterus. There, the blood flows out through a very small slit-like opening in the cervix. The cervix is the very bottom of the uterus, but the cervix sits in the top of the vagina. (The cervix feels somewhat soft and spongy, like the tip of a nose.)The blood flows anywhere from 3 days to 7 days, with the average being 4 or 5 days. A period can be light or heavy, short or long.While the female is bleeding, the body closes off the blood vessels where the lining pulled away from the wall of the uterus. Muscle contractions in the uterus keep pushing blood clots so they also flow out. These are very small pieces of tissue that are reddish-purple. The uterus keeps contracting off and on until there is only light bleeding... then no bleeding.About when a period ends, the body again releases hormones to prepare the uterine lining in case an egg is fertilized in the coming month. The lining begins to grow for the first 10 days or so of the new cycle. Then, the whole process repeats...
