Answer:
A. Smooth muscle
Explanation:
Smooth muscle aids in the digestion of food.
Answer:
Capillaries
Explanation:
In the circulatory sytem, the blood flow depends greatly on the blood vessels. As the blood flows through a vessel, it exerts a force against the walls of that vessel, and the measure of that force per unit area is defined as the blood pressure.
Like every other fluid, blood tends to flow from a high pressure region to a low pressure one. This means that when the blood ejects directly from the heart, in first instance it flows through the arteries, wich are the vessels with the highest pressure, then this arteries split into arterioles, where a drop in pressure occurs due to the smaller diameter that these vessels have, which at the same times generates more resistance to the blood flow and therefore a decrease in velocity and pressure. Then the arterioles split into the capillaries, which are the tiniest of all the blood vessels, meaning that they have the smallest diameter, therefore, a drop in pressure and velocity occurs once again when the blood reaches the capillaries. This decrease in velocity is very important because it allows for the exchange of nutrients and waste products between the capillaries and the cells.
Answer:
Autonomic regulation of heart is via two reflex centers that are found in medulla oblongata
Explanation:
Medulla oblongata contain long stem that makes the upper part of brain case and this is a cone shaped structure which is responsible for autonomic regulation like controlling heart rate,vomiting,respiration,breathing etc.
The heart rate is controlled by autonomic nervous system that are mainly sympathetic and parasympathetic nervous system that releases hormones like catecholamine (epinephrine and non epinephrine) which helps in controlling the heart rate.
Medulla oblongata mainly connects the brain with the spinal cord that are responsible for responsible for the autonomic functions which contain -
Controlling the ventilation via signalling system regulated by chemo receptors which detects change in acidity of the blood.
Acts on cardiovascular centers.
Controlling the reflex centers like vomiting,coughing,sneezing,swallowing etc.
Answer:
industrial wastes dumped into rivers
Explanation:
Because when factory and other industries dumped their wastes into water they begin to react on environment and fishes will die and that water or river smell so bad
