Question

tumor cells spread to other locations in the body through (select all that apply):

• loss of adherens junctions and desmosomes
• metastasis
• angiogenesis
• mitosis

question 6

communication between neurons ______. select all that apply

• involves neurotransmitters being released from postsynaptic neurons to presynaptic neurons.
• occurs when action potentials travel down a presynaptic neuron, causing the release of neurotransmitters onto the postsynaptic neuron.
• occurs across both the central and peripheral nervous system.

Explanation:

For the first question, tumor cell spread (metastasis) requires the loss of cell-to-cell adhesion structures like adherens junctions and desmosomes, which allows cells to detach from the primary tumor. Metastasis itself is the term for the spread to distant sites. Angiogenesis supports tumor growth by providing blood supply but is not the mechanism of spreading, and mitosis is simply cell division.

For the second question, neuronal communication typically involves an action potential traveling down the axon of a presynaptic neuron, triggering the release of neurotransmitters into the synaptic cleft to act on the postsynaptic neuron. This process is fundamental to both the central nervous system (CNS) and the peripheral nervous system (PNS). The first option is incorrect because neurotransmitters are released from presynaptic to postsynaptic neurons, not vice versa.

Answer:

Question 1:
Loss of adherens junctions and desmosomes
Metastasis

Question 6:
occurs when action potentials travel down a presynaptic neuron, causing the release of neurotransmitters onto the postsynaptic neuron.
occurs across both the central and peripheral nervous system.