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:
Rock particles can become pollutants by/from the wind. That is called erosion.
They can also become pollutants from man-made tools. For example a tool the polishes rocks releases all the dust and powder substance from the rock into the atmosphere.
There are also minute volcanic which are rock fragments formed during explosive shattering of sticky magma.
Answer:
During swallowing, a cartilagenous flap called epiglottis closes the entrance of wind pipe.
Explanation:
Dicots include annuals, biennials, vines, epiphytes (or air plants), parasitic plants, saprotrophs (such as mushrooms and molds) and aquatic plants. ... Microscopic pores on dicot leaf surfaces are usually scattered.
