What is the function of osteocytes ?

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

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

Match the type of cells in Column $\mathrm{I}$ with the organs they are part of, listed in Column $\mathrm{II}:$

Choose the CORRECT combination.

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.

The neurons that have two extensions, one axon and one dendrite are called _____ neurons.

Fill in the blank with the correct answer from the bracket.

_____ connective tissues occur in the walls of the arteries, vocal cord, trachea and bronchi. (Mucous, Elastic, Loose)

Fill in the blank with the correct answer from the bracket.

Haematology is the study of disorders related to  _____. (blood, lymph, lungs)

Fill in the blank with the correct options provided in the bracket.

_____(Bone/Muscle/Blood) is the chief component of our skeleton.