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Unit 6: Skel. & Rep.
Unit 6: Musculoskeletal & Reproductive Systems
| Term | Definition |
|---|---|
| Skeletal System's Jobs | provides shape and support, enables you to move, protects your organs, produces blood cells, stores materials |
| Joint | a place where two bones come together |
| Movable joints | allow the bones to make a range of movements depending on the type of joint |
| Immovable joints | connect bones in a way that allows little or no movement |
| Red bone marrow | produces the body's blood cells |
| Yellow bone marrow | stores fat |
| Involuntary muscles | not under your control (breathing and digesting food) |
| Voluntary muscles | under your control (moving your arm or leg) |
| Skeletal muscle | attached to the bones of your skeleton; voluntary movement |
| Cardiac muscle | muscle in your heart, involuntary like smooth muscle, does not get tired, but looks like skeletal muscle under the microscope |
| Smooth muscle | on the inside of many organs, such as the walls of the stomach and blood vessels; work automatically |
| Tendon | strong tissue that attaches muscle to bone |
| Asexual reproduction | Only 1 parent; all of the offspring are identical (clones) |
| Sexual reproduction | 2 parents; all of the offspring have different genes |
| Number of chromosomes in human body cell | 46 |
| Number of chromosomes in human egg cell | 23 |
| Number of chromosomes in human sperm cell | 23 |
| Chromosome | Package of DNA inside the nucleus of your cell |
| Testic | Produce sperm (males only) |
| Prostate | Produces liquid that mixes with the sperm to make semen (males only) |
| Scrotum | Skin that protects the testis (males only) |
| Bladder | Stores urine (pee) (males and females) |
| Urethra | Tube that carries pee out of the body in females, and pee and sperm out of the body in males |
| Penis | Organ where semen (a mixture of sperm and other liquids) leaves the body (males only) |
| Cervix | Opening from the vagina to the uterus (females only) |
| Vagina | Where the sperm enters and where the baby leaves the mother's body during birth (females only) |
| Uterus | Where the baby grows and develops (females only) |
| Ovaries | Store eggs. Release one egg per month into the fallopian tube starting into adolescence (females only) |
| Fallopian tubes | Carry the egg from the ovary to the uterus (females only) |
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