Examination of blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following, is likely to alleviate his symptoms?
A normal electrocardiogram $\text{(ECG)}$ is composed of a $P$ wave, a $\text{QRS}$ wave $($complex$)$ and $T$ wave. The $P$ wave represents electrical excitation or the atrial depolarization which leads to contraction of both the atria $($atrial contraction$)$. The $\text{QRS}$ wave $($complex$)$ begins after a fraction of second of the $P$ wave. It represents ventricular depolarization $($ventricular contraction$)$.
This wave is due to spread of electrical impulse through ventricles. The $T$ wave represents ventricular depolarization $($ventricular relaxation$)$. The $S – T$ interval represents the time between the end of the spread of impulse through ventricles and its depolarization. Thus, the $S-T$ segment begins at the end of the $S$ wave and terminates at the beginning of the $T$ wave.
In the extrinsic clotting pathway, the active factor $VII$ activates which factors?
A
$X$ and $XI$
B
$IX$ and $XI$
✓
$IX$ and $X$
D
$XI$ and $XII$
Answer
Correct option: C.
$IX$ and $X$
When there is damage to the blood vessel, the factor $VII$ leaves the circulation and comes in contact with the tissue factor $(TF),$ which is expressed on tissue$-$factor bearing cells, forming an activated $\text{TF - FVIIa}$. This $\text{TF - FVIIa}$ activates factor $IX$ and factor $X$.