Population density
What does a J-shaped curve represent?
Exponential Growth
Cells that transmit electrical message from one area of the body to another area.
Neuron
A vaccine produces _________________ immunity.
active
Given that a population of 30 cows has 6 births, what is the birth rate?
0.2
The main organs involved in nervous transmission
Brian and spinal cord
The largest number of individuals of a population that an environment can support.
Carrying capacity
Gaps in the myelin sheath between schwann cells.
Node of Ranvier
A nonspecific defensive response of the body to tissue injury characterized by dilation of blood vessels and swelling.
Inflamation
In the same population, there are 3 deaths, what is the death
0.1
For every 3Na+ ions pumped out-------ions are pumped in
2 potassium ions
A limiting factor that affects populations depending on their density.
Density dependent factor
State in which the polarity of the neuron is reversed as sodium ions rush into the neuron.
Depolarisation
What type of cells are involved in the humoral immune response?
B cells
Imagine a population of 50 butterflies, if 3 butterflies are born and 2 die what is the value of G?
1
What would happen if voltage-gated sodium channels were blocked?
Action potentials would not occur
Example of density-dependent factors
many possible answers
Process by which ATP is used to move sodium ions out of the cell and potassium ions back into the cell; completely restores the resting conditions of the neuron.
Na-k pump
Antibodies are produced by
B cells
Imagine a population of totaling to 200 individuals. During the first month 70 new individuals are born and 30 die, what is the population going to be at N5.
415
What happens if a person lacks memory B cells?
they cant recongize previously encountered pathogens
The percentages of individuals found at different age levels make up the ______ of the population.
Age structure
Period during which potassium ions diffuse out of the neuron resulting in a return of the polarization to its resting state
Repolarization
What alerts B cells to action?
T-cells specifically T-helper cells
What would be the size of a population of ducks at the end of the time period if N1= 30, b=0.2, d=0.1 and K=100
32
How can a population continue growing even if the birth rate decreases?
increased immigration