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:
Explanation:
Depression has been linked to problems or imbalances in the brain, specifically with the neurotransmitters serotonin, norepinephrine, and dopamine.
Answer:
Concentration, Temperature, Mass of Particle, Solvent /medium, surface area and permeability properties of membrane.
Explanation:
The random movement of particles causes the phenomenon called diffusion. The concentration gradients of particles pushes molecules in a direction such that molecules move from a region of high concentration to a region of lower concentration.
Diffusion is a passive process (not requiring the input of energy).
The following variables are factors that affects diffusion;
Concentration - down concentration gradient favours diffusion.
Temperature - temperature increases diffusion , the kinetic energy associated with each particle also increases.
Mass/size of Particle - Smaller particles on the other hand will diffuse faster because they can move faster.
Solvent /medium Properties - Viscosity and density of the medium greatly affect diffusion. Highly viscous and dense medium slows down diffusion.
Diffusion can occur through a membrane. The two factors that are particular to diffusion through a membrane are surface area and permeability.
Ice can cause hypothermia.
Ice can cause vasoconstriction
Ice can reduce blood flow to the burned area.
<h3>What are the reasons to avoid use of ice on burned body parts ?</h3>
Ice can result in hypothermia, which reduces blood flow to the burned area and causes the burned part to cool excessively. Ice has the potential to shrink the blood vessels supplying injured skin, resulting in a reduction in the amount of blood and oxygen delivered to the area.
- Applying ice does not stop further tissue damage; instead, it reduces blood flow, delaying the healing of the wound. Ice actually reduces blood flow owing to vasoconstriction, rather than increasing it, to the burned area.
Learn more about Burn injury here:
brainly.com/question/7282608
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