निम्नलिखित में से किस रक्त समूह वाले व्यक्तियों को 'सार्वभौमिक दाता' (यूनिवर्सल डोनर) माना जाता है?

Which of the following components are part of the circulatory system? I. Heart II. Blood vessels

Which portion of the human heart receives and pumps deoxygenated blood?

Which artery is routinely used to record blood pressure in the upper arm using auscultation?