A/P 1 Flashcards
Atoms
the smallest chemical units
Molecules
Group of atoms working together
Organelles
Group of molecules working together
Cells
groups of organelles working together
Tissues
group of similar cells working together
Organs
group of different tissues working together
Organ systems
group of organs working together in homeostasis
Organism
an individual where all organ systems working together in homeostasis
The body is divided into how many organ systems?
11
True or False:
Many organs work in more than one organ system
TRUE
Homeostasis
All body systems working together to maintain stable internal environment
Autoregulation (intrinsic)
Automatic response in a cell, tissue, or organ
ex: PLTs start clotting process after wound occurs
Extrinsic regulation
Responses are controlled by nerves and endocrine systems
Ex: air conditioning sensing temp too hot/cold and turning on/off
Regarding hemostasis: Receptor
receives the stimulus
Regarding hemostasis: control center
processes the signal and sends instructions
Regarding hemostasis: effector
carries out instructions
Negative feedback
response of the effector negates the stimulus
Positive feedback
Response of the effector reinforces the stimulus
Ex: clotting until bleeding is finished
Cranial (anatomical position)
Towards the head end of the body
Caudal (anatomical position)
towards the tail or away from the head end of the body
Posterior/dorsal (anatomical position)
The back portion of the body
Anterior/ventral (anatomical position)
The front portion of the body
Lateral (anatomical position)
side view
Frontal (anatomical position)
Front view
Anatomical direction
refers to the pt left or right
Proximal (anatomical position)
toward or near the trunk or point of attachment to the body
Distal (anatomical position)
Parts of the body further away from the center
Medial (anatomical position)
Towards the center of the body
Coronal plane (frontal plane)
divides the body into anterior and posterior portions
Sagittal plane
divides the body into left and right portions
Midsagittal plane
an imaginary vertical plane that runs through the body’s midline, dividing it into two equal halves.
Transverse plane
divides the body into superior and inferior portions
Supine
Position when laying on back
Prone
Position when laying on stomach
Proton
Located in nucleus with positive charge
Neutron
Located in nucleus with neutral charge
Electron
Located outside the nucleus on the orbitals with negative charge
Isotope
When the number of neutrons is different than P/E
Radioactive isotope
Spontaneous decay into elements with lower atomic number
Atomic mass
the sum of the masses of protons and neutrons
Atomic number
Number of protons of the element
Orbital
area around a nucleus where an electron is most likely found (rings)
Cation
When an atom has more protons than electrons thus holding a positive charge
Anion
When an atom has more electrons that protons thus holding a negative charge
Oxidation
loss of an electron
Reduction
Gain of an electron
Max # of electrons in the first shell
2
Max # of electrons in the outer shell
8
Which atoms have their outer shell filled?
Inert
Which atoms do not have their outer shell filled?
Reactive
Most common elements in the body?
Oxygen, carbon, hydrogen, nitrogen
Molecule (O2)
a group of atoms held together by energy in a stable association
Compound
composed of two or more different types of atoms bond together
What are the three types of atomic bonds?
Ionic, covalent, hydrogen
Ionic bond
formed when ions of opposite charges attract each other
Covalent bond
formed when two or more atoms share pairs of electrons
Hydrogen bonding
In a water molecule, both the oxygen and hydrogen atoms attract the shared electrons in the covalent bond (electronegativity)
Polar
when an atom had a slightly positive and slight negative charge