The part of the nervous system that controls involuntary action and responses.
a progressive disease that destroys brain cells and is identified by muscular tremors, slowing of movement, and partial facial paralysis
a disease that results in the progressive loss of an individual's memory and mental capacity.
"Lou Gherig's Disease" - progressive neurological disease in which the motor neurons degenerate to the point of total loss of motor function. The intelligence, memory, and personality is unaffected.
disorder in which myelin is destroyed causing loss of motor activity
Tough, white outer layer of the eye
middle layer of the eye; contains blood vessels
The light sensitive layer of the eye which is composed of receptors (rods and cones).
anterior cavity of the eye filled with clear, watery fluid
the clear colorless transparent jelly that fills the posterior chamber of the eyeball
a condition in which nearby objects are seen more clearly than distant objects
condition in which vision for distant objects is better than for near objects
rod-shaped receptor in the retina of the eye that is sensitive to dim light but not color
Receptor cells in the retina that are sensitive to bright light and produce color vision.
visible part of the outer ear. It collects sound and directs it into the auditory canal
the membrane that separates the outer ear from the middle ear and that vibrates when sound waves strike it (tympanic membrane)
the bone attached to the eardrum
the bone between the hammer and the stirrup
a tiny U shaped bone that passes vibrations from the anvil to the cochlea
membrane that covers opening between middle ear and inner ear
a coiled tube that is found in the inner ear and that is essential to hearing
3 loops of fluid filled tubes that that are attached to to the cochlea; maintains equilibrium
sensitive nerve cells in nasal passages.
tube connecting ear to throat; helps to equalize pressure
monthly shedding of the lining of the uterus when fertilization does not occur
the stage of the menstrual cycle where the pituitary gland produces FSH which starts the maturation of an egg
name given to the follicle after ovulation, secretes progesterone
secreted by pituitary; regulates estrogen secretion and ovum development in the female and testosterone production in the male
Hormone produced by the ovaries which controls the development of eggs and adult female characteristics.
hormone produced by the corpus luteum which promotes uterine lining growth
follicle stimulating hormone
secreted by the anterior pituitary gland to stimulate development of reproductive cell follicles
The process by which a mature egg is released from the ovaries into the fallopian tubes.
the cell resulting from the union of an egg and sperm
a developing human, from fertilization through the first 8 weeks of development
the developing organism from the end of the eighth week until birth
the solid mass of cells resulting from the cleavage of the ovum before the formation of a blastula.
hollow ball of cells formed during the early stages of embryological development; also known as a blastocyst
the embryo in the stage of development after the blastula; contains the embryonic germ layers
innermost germ layer- forms the digestive tract
outermost germ layer; becomes skin and nervous system
germ layer between ectoderm and endoderm
rapid mitotic division of a zygote that occurs immediately after fertilization
Process in which cells become specialized in structure and function.
the fluid-filled cavity inside a blastula
opening formed when the blastula folds in on itself
cavity within the gastrula
The primitive spinal cord that develops from the ectoderm, the top of which swells to form the brain.
ability of one group of embryonic cells to influence the development of another group
The outermost of four extraembryonic membranes; contributes to the formation of the mammalian placenta.
The innermost of four extraembryonic membranes; encloses a fluid-filled sac in which the embryo is suspended.
One of four extraembryonic membranes; collects embryo's nitrogenous waste.
The membrane that is attached to a vertebrate embryo and that encloses the yolk;stores energy reserves for the developing embryo.
organ in placental mammals through which nutrients,oxygen, carbon dioxide, and wastes are exchanged between embryo and mother
In placental mammals, the structure that connects the fetus and the placenta.
Harmful agents or substances that can cause malformations or defects in a embryo of fetus
the stage in life during which reproductive hormones begin to be formed. Reproductive development occurs during this stage
long, coiled tubes inside the testes
cells surrounding the seminiferous tubules in the testes
cells in the seminiferous tubules that support, regulate, and nourish developing sperm
in human males, the tube within the scrotum in which sperm mature and become motile
glands that produce a mucus-like fluid containing fructose as energy for sperm
Exocrine gland, in men, at the base of the urinary bladder. It secretes alkaline fluid (part of semen) into the urethra during ejaculation to neutralize the acidity of the female reproductive tract.
gland in human males that secretes an alkaline fluid that neutralizes the acidity of the female reproductive tract during ejaculation
fluid made of sperm and fluid from the prostrate and Cowper's glands
hormone that acts on the hypothalamus to stimulate the production of releasing factors that trigger release of FSH. The interaction of FSH and inhibin controls the rate of formation of sperm.
steroid hormone produced in the testicles that is responsible for the development of male secondary sexual characteristics
the mucous membrane that lines the uterus and increases in thickness in the latter part of menstrual cycle
two glands that are suspended in the abdominal cavity and produce eggs (ova)
pair of tubes in the body that transport an egg (ovum) from the ovary to the uterus
finger-like projections that sweep eggs from where they exit the ovaries into the fallopian tubes
in a human female, period of 25 - 40 days during which hormones stimulate the development of the uterine lining, and an egg is developed and released from an ovary. If the egg is not fertilized, the uterine lining is shed as the cycle begins again.
in the female reproductive system, groups of cells held in the ovaries. Each one of these cells contains an ovum (egg) that will develop
stage of the menstrual cycle that begins with ovulation. During this stage, LH stimulates the corpus luteum to produce progesterone, which inhibits the growth of other follicles so that only one ovum is released during each cycle.
period in women's life during which a decrease in estrogen and progesterone results in an end of menstrual cycle
hormone replacement therapy
administration of low levels of estrogen and/or progesterone to alleviate symptoms of menopause
diseases such as AIDS, chlamydia, or genital herpes that is normally passed from one person to another through sexual activity
physically incapable of conceiving offspring
incapable of becoming pregnant or of inducing pregnancy
a way of avoiding pregnancy, using either artificial methods such as condoms and birth control pills or natural methods such as avoiding sexual intercourse during a woman's none fertile periods
first stage in embryonic development, when a sperm and egg interact successfully to form a zygote
stage which follows the morula
thin outer layer (ectoderm) that encloses the embryo of mammals, attaches the fertilized ovum to the wall of the uterus, and absorbs nutrients
the embryo's attachment of itself to the endometrium, occurs within the first week after fertilization in humans
thin flexible sheets of tissue that are not part of the embryo but that support, nourish and protect it
three cellular layers in the gastrula - ectoderm, endoderm and mesoderm
vertebrate embryo in the stage during which the nervous system begins to develop
the process in which each of the three layers of the gastrula develop into different parts of the body
May cause the release of oxytocin. Prostaglandins together with oxytocin cause the uterus to contract, signaling the beginning of labour
process of giving birth to a baby
the secretion and formation of breast milk by the mammary glands