Question

Part B - LO 2, Identify the Critical Contributions of Water and Electrolytes to Human Functioning

Water plays an important role in solubility, transport, blood volume, blood pressure, and regulation of body temperature. Electrolytes help maintain fluid balance and assist with the generation of nerve impulses. Each of these contributions is essential for life and must remain in balance.

Choose the correct statement about water and electrolytes.

Water has a low heat capacity.

After a muscle fiber is stimulated by a nerve signal, a release of stored calcium ions leads to muscle contraction.

Sodium influx into a nerve cell leads to an increase in negative charge and depolarization.

Water does not make a good solvent.

Answer 1

Water has a high heat capacity, as it takes a high amount of energy to change temperature of water.  

When a muscle fibre is stimulated by a nerve signal, it causes release of stored Calcium ions in the sarcoplasmic reticulum and thus causes muscle contraction.

Sodium influx into a nerve cell causes increase in positive (not negative) charge, and depolarisation.

Water is a good solvent by the property of its Solvency which enables it to act as solvent for wide range of substances.

So the correct statement is B) After a muscle fibre is stimulated by a nerve signal, a release of stored Calcium ions leads to muscle contraction.