Lab exam 1 flashcards
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describe cell theory
- all organisms are composed of cells
- cells are the basic living units of organization and function in all organisms
- all cells arise only by the division and reproduction of previously existing cells
glial cells
make nerve impulses and provide a nutritive role for nuerons
describe tissue
a group of similar cells that work together to preform a common function for an animal
what are the 4 types of tissues
connective
muscle
nervous
epithelial
what does epithelial tissue do
covers external surfaces, or lines the internal surface of body cavities, acts as barriers
what does connective tissue do
binds, supports, and protects body parts & systems
what does muscle tissue do
permits movement of animal through its environment
what does nervous tissue do
serves in communication & control of the animal
what do erythrocytes do
red blood cells, they carry oxygen from our lungs to the rest of our body
what do leucocytes do
white blood cells, attack bacteria and viruses
why do cells divide
to heal wounds, to grow, regenerate worn out or damaged tissues
what 2 ways do cells divide
mitosis and meiosis
describe cell cycle
- interphase, longest stage, (G1 (growth), S phase (synthesis), G2 (growth),
- prophase
- metaphase
- anaphase
- telophase
- cytokineses
how many daughter cells are produced through mitosis?
2 daughter cells each containing a complete set of chromosomes identical to that of the parent cell
working distance
the space between the objective lens and slide on a microscope
field of view
the circular view you see when looking through the microscope
depth of field
the thickness of an image that is acceptably in focus when looking through the ocular lense
embryology
study of embryos & their development
(embryo - initial cell stage of animal development )
zygote
fertilized egg cell as a result of the union of a female gamete (egg or ovum) with a male gamete (sperm)
gametogenesis
production of egg or sperm cells
blastopore
the opening by which the cavity of the gastrula, an embryonic stage in animal development, communicates with the exterior
archenteron
hallow tube created by the arrangement of invaginated cells in the gastrula; embryonic precursor to the gut (also the same as gastrocoel)