Sentence:  It is also possible to utilize a pressure transducer , mounted at the end of a catheter which is inserted into the heart 's left ventricle , to indicate the <WSD>blood</WSD> pressure in the heart itself . 
Meaning of the word marked with <WSD> tags:  the pressure of the circulating blood against the walls of the blood vessels; results from the systole of the left ventricle of the heart; sometimes measured for a quick evaluation of a person's health