cells, tissues, organs pt 1 Flashcards
which is the most viewed visible structure in the cell?
nucleus (contains chromosomes which contain DNA.)
define cell
a small unit of living protoplasm, always surrounded by a cell membrane and sometimes in plants also by a non-living cell wall.
The living material between the nucleus and the cell surface membrane is known as
cytoplasm (contain organelles)
(cytoplasm + nucleus= protoplasm)
The only organelle found in animal cells but not in plant cells is
centriole
define organelle
a distinct part of a cell which has a particular structure and function.
the extra detail shown by the electron microscope is called
Cell Ultrastructure
The photograph taken by an electron microscope is called
Electron Micrograph
plant cell differences (6)
Cell wall
Plasmodesmata
Chloroplasts
Large central vacuole (contains sap)
Tonoplast
Middle lamella
formula for Nucleus
Nucleolus + nuclear envelope + chromosomes
Most of our cells in our bodies do not look exactly alike. Why?
cells grow differently as they specialize for one particular function.
cells
the basic unit of life
Tissues
a collection of similar cells working together to carry out the same function
ex: muscle tissue
Organs
a collection of different tissues working together to carry out one function
Organ systems
a collection of different organs and tissues working together to carry out one function
ex: circulatory system
