A person while climbing up a rocky hill comes into a panic state and fear. His body starts reacting in a…
A person while climbing up a rocky hill comes into a panic state and fear. His body starts reacting in a "flight-or-flight" condition to adjust to the dangerous and stressful situation.
Based on the above facts, answer the questions that follow.
(a) (i) Name the hormone secreted in the blood of the person in this situation.
(b) State any two responses in the body of the person as a result of the secretion of this hormone.
(c) How does the action of the chemical signal in terms of hormones differ from the electrical impulses via nerve cells ?
Solution
(a) (i) Adrenaline
OR
(ii) Adrenal Gland
(b) Heart beat becomes faster to supply more oxygen to the muscles / blood supply to the digestive system is reduced / blood supply to the skin is reduced / blood is diverted to the skeletal muscles / breathing rate increases/increased contractions of diaphragm and rib muscles.
(Any two)
(c) Chemical signal - travel through bloodstream and reach a wide range of target cells across the body.
Electrical signal - travels through a nerve cell.
(Any other)