Define bipolar neurons.

Study the following statements
$A)$ Compound epithelium forms the lining of the larger pancreatic ducts as stratified cuboidal epithelium
$B)$Cartilage is a vascular tissue surrounded by fibrous connective tissue sheath called perichondrium
$C)$Gap junctions in cardiac muscles permit electrical impulses to be conducted rapidly
$D)$ Myelinated nerve fibres are found in grey matter of the central nervous system

Among the above, identify incorrect statements

Which one of the following is incorrect regarding WBCs?

(a) Monocytes migrate from the bloodstream to other tissues and differentiate into tissue-resident macrophages, Kupffer cells in the liver.

(b) Eosinophils modulate allergic inflammatory responses.

(c) Basophils release histamine for inflammatory response.

(d) Natural killer cells are a type of phagocytic erythrocytes.

Study the following statements and identify the correct statements-
$\mathrm{I})$ Microglial cells keep the cerebrospinal fluid in the ventricles of brain in constant circulation
$\mathrm{II})$ Arrector pili muscles are unstriated muscles
$\mathrm{III})$Basophils remove antigen-antibody complexes from the blood
$\mathrm{IV})$ Perichondrium is absent in fibrous cartilage

Observe the following diagram of brain of man and identify the parts labelled as I and III.

Assertion ($\mathrm{A}$): In myelinated nerve fibres, action potentials are conducted at a faster rate.

Reason ($\mathrm{R}$): The myelin present between nodes of Ranvier has concentrated $\mathrm{Na}$ and $\mathrm{K}$ voltage-gated channels.