The correct answer is I, II and III.
A phagocytic cell of a vertebrate organism is a critical component of the immune system. Its main action is to engulf and ingest foreign and possibly harmful particles, bacteria and dead or dying cells.
There are many different types of phagocytes and some of these include the macrophages, the neutrophils, and the dendritic cells.
The macrophages are phagocytic cells which can exit the bloodstream and detect pathogens outside the circulatory system.
Neutrophils contain toxic granules which can kill pathogens only by contact. Dendritic cells are located in the parts of the body which can easily be infected and can act as messengers who warn the body of threats. They do so by sending antigens as messages.
Hi Brenaroo14
Each genus of organisms is divided into classes.
Answer: D) genus or the fourth option.
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.
<span>Subunits of nucleic acids are called nucleotides.</span>
The answer would be: True.
