What occurs during hyperpolarization of a neuron membrane?
A) Both sodium and potassium ions are leaving the cell
B) Potassium ions are leaving the cell
C) Sodium ions are entering the cells
D) Potassium ions are entering the cell
E) Sodium ions are leaving the cell
B
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Each neuron in the CNS may receive input from
A) only one synaptic knob. B) about 10 dendrites. C) thousands of axons. D) one synaptic knob at each end.
The process of dissolving bone and returning its minerals to the bloodstream is known as ________.
A. resorption B. mineralization C. crystallization D. mineral deposition E. ossification
Matching
A) Microtubules B) Nucleoli C) Ribosomes D) Endoplasmic reticulum E) Nucleus 26) Plays a role in the synthesis of steroid-based hormones and proteins. 27) The organelle that facilitates peptic bond formation between amino acids. 28) Play a critical role in forming spindle fibers for cell division, organize and move organelles as well as giving shape to the cell. 29) Dense spherical bodies in the nucleus that are the synthesis site for ribosomal RNA. 30) The vast majority of the cell's genetic material is housed here.
Negative selection is the process by which cells learn self-tolerance
Indicate whether this statement is true or false.