Cardiac activities of the heart are regulated by: A. Nodal tissue B. A special neural centre in the medulla oblongata C. Adrenal medullary hormones…

The mother has $\mathrm{A}+$ blood group the father has $\mathrm{B}+$ and the child is $\mathrm{A}+$. What can be the possibility of genotypes of all three, respectively? A. $\quad I^A I^A\left|I^B i\right| I^B i$ B. $\quad I^A I^A\left|I^B i\right| I^A i$ C. $\quad I^B i\left|I^A I^A\right| I^A I^B$ D. $\quad I^A I^A\left|I^B I^B\right| I^A i$ E. $\quad I^A i\left|I^B i\right| I^{A_i}$ Choose the correct answer from the option given below:

Given below are two statements : Statement I : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. Statement II : Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes. In the light of above statements, choose the most appropriate answer from the options given below :

A person with blood group $\mathrm{ARh}^{-}$can receive the blood transfusion from which of the following types? A. $\mathrm{BRh}^{-}$ B. $\mathrm{ABRh}^{-}$ C. $\mathrm{ORh}^{-}$ D. $\mathrm{ARh}^{-}$ E. $\mathrm{ARh}^{*}$ Choose the correct answer from the options given below :

Match List I with List II : \begin{array}{|l|l|l|l|}\hline & List I & & List II \\\hline A. & P wave & I. & Heart muscles are electrically silent. \\\hline B. & QRS complex & II. & Depolarisation of ventricles. \\\hline C. & T wave & III. & Depolarisation of atria. \\\hline D. & T-P gap & IV. & Repolarisation of ventricles. \\\hline\end{array} Choose the correct answer from the options given below :

As per ABO blood grouping system, the blood group of father is $\mathrm{B}^{+}$, mother is $\mathrm{A}^{+}$and child is $\mathrm{O}^{+}$. Their respective genotype can be A. $\quad{ }^{\mathrm{B}} / / \|^{A^A} / / i \mathrm{i}$ B. $\left.\quad I^{\mathrm{B}}\right|^{\mathrm{B}} /\left.\left.\right|^{\mathrm{A}}\right|^{\mathrm{A}} / \mathrm{ii}$ C. $|\mathrm{A}| \mathrm{B} /\left.i\right|^{\mathrm{A}} /\left.\right|^{\mathrm{B}} \mathrm{j}$ D. $\quad \mathrm{A}_{\mathrm{A}} / I^{\mathrm{B}} / /^{\mathrm{A}} \mathrm{i}$ E. $\quad \mathrm{il}^{\mathrm{B}} /\left.\mathrm{i}\right|^{\mathrm{A}} /\left.\mathrm{I}^{\mathrm{A}}\right|^{\mathrm{B}}$ Choose the most appropriate answer from the options given below :