Biology questions
20584 published questions with worked solutions.
- Blood enters the right atrium, via.
- Pacemaker of the heart is
- Human heart is
- Heart beat is defined as
- How many caval veins open into the right auricle in man?
- Auricular or atrial systole lasts for
- In which chamber of a mammalian heart does O_2 rich blood enter first?
- Opening of inferior vena cava is guarded by a
- Duration of one heart beat in man is
- Conduction of impulse from S.A. node moves to
- During inspiration, heart rate increases and during expiration it falls. This phenomenon is known as
- At the base of pulmonary aorta and systematic aorta valves are present, which are called as
- Joint diastole lasts for
- Systemic aorta arises from
- Opening of coronary sinus is guarded by _____ valve
- Contraction of heart is initiated by
- Human heart consists of _____ chambers
- A rhythmic contraction and relaxation of heart during one heart beat is called
- The left atrioventricular aperture in man is guarded by
- The smallest and thinnest blood vessels in the body is