The (i)___, controls both the heart rate and the stroke volume. There are two separate nerves from the cardiovascular centre to the sinoatrial node: the (ii)___, to speed up the heart rate and the (iii)___, to slow it down. (i) receives information from special cells called (iv)___, present in the aortic arch and in the carotid sinus.
(i) Cardiac centre, (ii) Parasympathetic system, (iii) Sympathetic system, (iv) Baroreceptors
(i) Cardiac centre, (ii) Sympathetic system, (iii) Parasympathetic system, (iv) Baroreceptors
(i) Sympathetic system, (ii) Baroreceptors, (iii) Cardiac centre, (iv) Parasympathetic system
(i) Baroreceptors, (ii) Sympathetic system, (iii) Parasympathetic system, (iv) Cardiac centre
Go through the following statements: (i) The stroke volume multiplied by heart rate gives the cardiac output. (ii) The second heart sound is associated with the closure of semilunar valves. (iii) Heart failure is the same as cardiac arrest or a heart attack. Which of these are correct?
(i) & (ii)
(ii) & (iii)
(i) & (iii)
All are correct
If a person is suffering from blood loss, the cardiac output will __(i)____ , blood vessels will _(ii)_____ and the heartbeat will be ___(iii)____.
(i) increase, (ii) constrict, (iii)increased
(i) decrease, (ii)constrict, (iii) increased
(i) increase, (ii) dilate, (iii) decreased
(i) decrease, (ii)dilate, (iii) increased
If the blood pressure is too low, the cardiovascular control centre in the medulla oblongata attempts to compensate by causing a/an _______.
Decreased cardiac output
Increased contractility of the myocardial cells
Systemic arteriolar dilation
Decreased heart rate
Which of the following nerves causes the adrenal medulla to release epinephrine and norepinephrine and also speed up body activities?
Which of the following is NOT correctly matched?
Cardiac centres - Cardiovagal and Vasomotor
Baroreceptors - Present in aorta and carotid
Positive Inotropic action - Increases the firing rate of Sinoatrial node
Negative Chronotropic effect - Increases the force of contraction of heart
- more RBCs and less WBCs
- Plasma without proteins
- more WBCs and no RBCs
- no plasma
The thoracic and right lymphatic ducts return lymph to the ______.
Role of spleen of mammals is to
Act as a haempoietic tissue
Secrete digestive enzymes
Which of the following is/are the composition of the fluid in lacteals?
Fats and chyme
Chyme and chyle
- Chyme and lymph
Lymph and fat