When the Jet of an Active Galaxy Is Aimed Directly

question 60

Multiple Choice

When the jet of an active galaxy is aimed directly at Earth, astronomers might classify the object as a

• A) radio galaxy.
• B) BL Lacertae object.
• C) pulsar.
• D) Seyfert galaxy.

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Definitions:

Motor End Plate

A region of muscle fiber membrane that receives signals from nerves, triggering muscle contraction.

Presynaptic Membrane

The part of the nerve cell that is situated at the synapse and releases neurotransmitters in response to a nerve impulse.

Motor Neuron

A motor neuron is a nerve cell that initiates and transmits a signal to a muscle or gland to trigger a response.

Electrical Impulses

Rapid changes in electric potential that travel along nerves or muscle fibers to transmit signals.