Bones
Bone cells that destroy/break down old bone are called...
osteoclasts
The deepest layer of epidermis is called...
Stratum Basale
The electron shell around an atom is most stable if it contains ___# electrons
8 electrons
Active transport differs from passive transport because it requires...
ATP Energy! (also goes against the concentration gradient)
The term homeostasis means...
The tendency for physiological systems to stabilize internal conditions with respect to the external environment.
osteon
Which layer of epidermis reveals if skin is thick or thin?
Stratum Lucidum
An acidic solution contains more ____ ions
hydrogen (basic has more hydroxide)
A hypotonic solution would cause what to happen to the cell?
More water moves INTO the cell (lysed/fills up)
In homeostasis, a receptor does what?
helps the body detect information (ie, a stimulus) from the environment.
What is the outer covering of a bone, where tendons connect into?
periosteum
What are keratinocytes?
the primary cell of the epidermis, produces keratin (extra credit if you said they are located in the stratified squamous epithelium)
What does it mean for a cell membrane to be selectively permeable?
It allows certain molecules to pass, while blocking others.
Facilitated diffusion requires...
a carrier or channel protein (still goes along a concentration gradient)
With a negative feedback system, how does the body respond?
The variation outside normal ranges triggers an automatic response that corrects the situation (works to adjust the system back to normal)
Bone cells that secrete a matrix to form new bone are called...
osteoblasts
Compare serous membrane and mucous membrane.
Serous membranes reduce friction between organs and the body. Mucous membranes line internal passages to allow movement/protection within the passage.
What type of cells are on the surface of epithelium?
Squamous
Does osmosis move water with or against the concentration gradient?
WITH (when solutes cannot pass, the water levels change to create equilibrium)
In homeostasis, an effector does what?
It is the cell or organ responding to the control center. It creates a response; usually results in a return to previous (“normal”) conditions.