Brain, biology, and behavior.
Answer five questions about Biological Psychology and get instant feedback.
What connects the brain to the rest of the body through nerves?
Nerves are like fast data cables: some carry sensations up to the brain, and others send commands back down to muscles and organs in tiny electrical pulses.
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The brain coordinates perception, movement, memory, emotion, and decision-making through connected systems.
Hormone levels are often controlled by feedback that pushes them back toward a ...
Most hormones use negative feedback loops, like cortisol lowering CRH and ACTH after stress, which prevents runaway effects while still letting levels rise and fall with daily rhythms.
What triggers cortisol release that helps put more glucose into the bloodstream?
When your brain senses a threat, the HPA axis kicks in: the hypothalamus and pituitary signal the adrenal cortex to release cortisol, which mobilizes fuel but stays high with chronic stress.
Nervous system signaling gets faster when axons are ...
Myelin enables saltatory conduction, so action potentials "jump" between nodes of Ranvier, boosting velocity and efficiency, which is why demyelination in multiple sclerosis can severely slow signaling.
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