Nervous & Endocrine Systems: What Really Happens When You Step on a Lego: Crash Course Biology #46

What causes similar physical reactions like a racing heart and fast breathing when experiencing both anxiety and excitement?

• External environmental factors

• The body's internal communication systems

• Emotional state alone

• Muscle contractions

For multicellular organisms to grow, develop, and respond to changes, what must their cells and organs do?

• Act independently without coordination

• Create beautiful harmonies and work together

• Compete with each other for resources

• Only respond to external stimuli

What are the three main jobs of the nervous system?

• Digesting food, absorbing nutrients, and eliminating waste

• Collecting information, processing information, and responding to information

• Pumping blood, exchanging gases, and filtering waste

• Producing hormones, regulating growth, and controlling metabolism

The nervous system is primarily responsible for what kind of responses in the body?

• Long-term growth and development

• Regulation of hormonal cycles

• Short-term, rapid reactions

• Immune system defense

How does the nervous system transmit information from sensory receptors to the central nervous system?

• Through hormones in the bloodstream.

• Via electrical signals along neurons and across synapses.

• By direct contact between all cells.

• Using magnetic fields.

What does a bitter taste in food often signal to the brain?

• It is rich in carbohydrates.

• It contains essential minerals.

• It might be poisonous.

• It is high in acids.

How do hormones travel from the glands that produce them to target cells throughout the body?

• Through direct nerve connections.

• By jumping across synapses.

• Via the bloodstream.

• Through electrical impulses.

When a gazelle smells a lion, what is the immediate role of its nervous system in the "fight or flight" response?

• To release hormones directly into the muscles.

• To slow down the heart rate and breathing.

• To send a message to the muscles to move and signal endocrine glands.

• To interpret the smell as a food source.