Saxitoxin (STX) Is the Most Well -Known Paralytic Shellfish Toxin

question 96

Multiple Choice

Saxitoxin (STX) is the most well -known paralytic shellfish toxin caused by the phenomenon known as "red tide." Which statement below best describes why this neurotoxin causes paralysis?

• A) It acts by blocking voltage -gated sodium channels which are needed to generate an action potential.
• B) It acts on the hypothalamus of the brain, shutting down all neurological functions.
• C) It prevents the synaptic vesicles from migrating to the axon terminal; therefore, no action potentials are generated.
• D) It blocks ligand -gated channels on the postsynaptic membrane, which blocks signals leaving the central nervous system.
• E) It acts on the potassium channels within a neuron, hyperpolarizing the cell membrane; therefore, no action potential can be generated.

Classify transactions into operating, investing, and financing activities.

Calculate net cash provided by or used in operating, investing, and financing activities.

Identify the impact of non-cash transactions on the statement of cash flows.

Understand the direct and indirect methods for calculating cash flows from operating activities.

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Definitions:

Phagocytes

Cells responsible for defending the body by absorbing dangerous foreign materials, bacteria, and cells that are either dead or in the process of dying.

Monocytes

A type of white blood cell that plays a key role in the immune response, capable of differentiating into macrophages and dendritic cells.

Macrophages

A type of white blood cell part of the immune system, involved in the detection, phagocytosis, and destruction of bacteria and other harmful organisms.

Tumor Necrosis Factor (TNF)

A cell signaling protein (cytokine) involved in systemic inflammation and is part of the immune system's response to infections and diseases.