Answer:
a) True
Explanation:
The heart contains cardiac autorhythmic muscle cells, which are specialized cells that generate their own action potential without the need to receive it from nerve cells. These self-stimulated or self-excitable cells work together and function as the heart's natural pacemaker, which initiates an electric potential at a constant rate, and this potential travels through the heart triggering its contraction in an organized manner called the cardiac cycle.
These autorhythmic cells are found in the SA (sinoatrial) node in the right atrium of the heart, the AV (atrioventricular) node in between the atria and the ventricles, and in the fibers that connect these two nodes with each other and with the rest of the heart. All these structure working together is what's called the heart's electrical system.
Answer:
Lack of ADH increase urine volume and decrease urine concentration.
Explanation:
ADH is a hormone which is responsible for regulation of urine volume. The hormone is released in the blood from the posterior pituitary when the ion concentration in the blood becomes high.
This hormone acts on the nephron especially on distal convoluted tubule and collecting duct and increases their permeability towards water which in absent of ADH is impermeable to water.
This increased permeability allows the reabsorption of water from these sections which reduces the blood volume and helps in producing concentrated urine.
Most of them happen at home I believe
