Which of the following is associated with a decrease in cardiac output?

(1) Sympathetic nerves

(2) Parasympathetic neural signals

(3) Pneumotaxic center

(4) Adrenal medullary hormones

Single circulation is characteristic of

1. Fish heart

2. Frog heart

3. Crocodilian heart

4. Marsupial heart

The decrease in the rate of heartbeat, speed of conduction of action potential and thereby the cardiac output is under the control of

1. Neural signals through the sympathetic nerves

2. Neural signals through the parasympathetic nerves

3. Adrenaline

4. ANS 

Human heart is

1.  Myogenic

2.  Neurogenic

3.  Venous

4.  Both (1) and (2) 

Given below is the ECG of a normal human. Which of its components is correctly interpreted below?

1.  Peak P and Peak R together   -   Systolic and diastolic blood pressure

2.  Peak P       -       Initiation of left atrial contraction only

3.  Complex QRS    -      One complete pulse

4.  Peak T         -          Initiation of total cardiac contraction 

A special neural center that can moderate the cardiac function is located in 

1.  Cerebrum 

2.  Pons

3.  Medulla oblongata

4.  Cerebellum 

Lymph ultimately release the absorbed substances into

1.  Lymphatic capillaries

2.  Bloodstream (veins)

3.  Lymph nodes

4.  Lymphatic duct 

Read the following

a.  Lymph absorbs and transports fat from the intestine

b.  Lymph nodes produce fibrinogen.

c.  Lymphatic capillaries present in the intestinal villi are known as lacteals.

d.  Lymph transports oxygen only.

Which of these statements are true?

1.  a, c

2.  b, d

3.  c, d

4.  a, b

Atrial systole

1.  Increases the flow of blood into the ventricles by 70 percent

2.  Is due to the generation of the action potential in AVN

3.  Increases the flow of blood into the ventricles by 30 percent

4.  Coincides with ventricular systole

Which of the following is known as the natural pacemaker of the heart?

1.  Sino atrial node

2.  Atrioventricular node

3.  Bundle of His

4.  Purkinje fibers