Concept 4.3 Lecture Video and Quiz

What is the primary function of the endocrine system?

• To digest food

• To transport oxygen in the blood

• To secrete hormones that regulate body functions

• To produce electrical signals

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Hormones are best described as:

• Nutrient carriers

• Electrical impulses

• Physical barriers

• Chemical messengers

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How does the nervous system primarily send signals?

• Through hormones in the blood

• Via action potentials and neurotransmitters

• Through mechanical movements

• By releasing enzymes

Which system is responsible for more immediate responses?

• Respiratory system

• Digestive system

• Nervous system

• Endocrine system

What type of gland releases non-hormonal substances like sweat?

• Adrenal glands

• Thyroid glands

• Endocrine glands

• Exocrine glands

Which of the following is an endocrine gland?

• Salivary gland

• Sweat gland

• Pituitary gland

• Sebaceous gland

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NGSS.HS-LS1-3

What mechanism does the endocrine system use to control hormone synthesis and release?

• Direct stimulation

• Negative feedback

• Random release

• Positive feedback

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Which type of stimulus involves hormone release due to altered levels of ions or nutrients?

• Mechanical stimuli

• Neural stimuli

• Hormonal stimuli

• Humoral stimuli

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What is required for a hormone to alter the activity of a target cell?

• Specific receptors on the target cell

• Direct contact with the target cell

• High blood pressure

• Presence of neurotransmitters

What happens to target cells with prolonged exposure to high hormone concentrations?

• They increase the number of receptors

• They decrease the number of receptors

• They stop functioning

• They become more sensitive

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