Unit 1 - Chapter 2 - Terms Pertaining to the Body as a Whole Flashcards
(122 cards)
what does the cell membrane do and what does it determine?
- it is a structure that surrounds and protects the cell
- it determines what enters and leaves the cell
what is the nucleus in relation to a cell and what does it contain/direct?
- it is the control center of the cell
- it contains chromosomes
- it directs activities of the cell
what are chromosomes and how many do cells have?
- they are rod shaped structures in the nucleus that contain regions of DNA called genes
- there are 46 choromosomes (23 pairs) in each cell
- sex cells only have 23 individual chromosomes
what is dna, where is it found, what it it arranged like and what does it do?
- deoxyribonucleic acid
- chemical found within each chomosome
- arranged like a sequence in code
- directs activites of the cell
what are genes?
- regions of dna within cells
what is a karotype?
- picture (classification) of choromosomes in the nucleus
- chromosomes are arranges in numeric order to deterime there number and structure
what is cytoplasm?
- all the material that is outside the nucleus and yet contained within the cell membrane
what is the mitochondria, what is it reffered to as and what occurs there?
- rod shaped structure in the cytoplasm that provides the principle source of energy
- referred to as the “powerhouse” of the cell
- catabolism occurs here
what is catabolism?
- when complex nutrients are broken down to simplier substances and energy is released
what is the endoplasmic reticulum (er) and what occurs there?
- network of canals within the cytoplasm
- anabolism occurs here
what is anabolism?
- when large proteins are built from small proteins called amino acids
what are ribosomes and what do they do?
- small granules on the er
- the arrange amino acids on the er to make proteins
what is metabolism?
- total of the chemical process in a cell
- includes catabolism and anabolism
describe a muscle cell
- long and slender
- has fibers that aid in contracting and relaxing
describe a epithelial cell
- lining/skin cell
- square/flat to offer protection
describe a nerve cell
- long fibrous extensions that help in carrying out impulses
describe a fat cell
- cell that contains large emty spaces for fat storage
what is a histologist
- a scientist who studies tissues
where is epithelial tissue found and what is it responsible for?
- skin, lines organs and endocrine/exocrine glands
- responsible for the secretions that glands produce
what are the 2 catagories of muscle tissue and where are they found?
- voluntary and involuntary
- voluntary muscle if found in arms and legs
- involuntary muscle is found in the heart and digestive system
where is nervous tissue found and what is it responsible for?
- found in the brain, spinal cord and nerves
- responsible for conducting electrical impulses
what does connective tissue contain?
- adipose (fat) tissue
- cartilage (connective tissue found attached to bones at joints)
what does viscera refer to
the internal organs
describe the organizational structure of the human body
- cells
- then tissues (group of similar cells)
- then organs (group of similar tissues)
- then systems (group of different organs)w