Human Heart

Read the following statements (i - iv) about human heart : (i) Human heart is myogenic and our body has the ability to alter the heart rate , cardiac output but not stroke volume. (ii) P - wave in ECG marks the atrial systole . (iii) Adrenal medullary hormones acts on SA node and increases heart rate. How many statement is/are correct form the above ?

Which one of the following statements is correct about the human circulatory system? (A) Blood transports only oxygen and not carbon dioxide. (B) Human heart has five chambers. (C) Valves ensure that the blood does not flow backwards. (D) Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.

Consider the following four statement (i) - (iv) and select the correct option. (i) SA node is natural pacemaker of heart (ii) Human heart has inter-auricular foramen (iii) Right atrioventricular valve is a semilunar value (iv) Normal systolic and diastolic pressure of human is 120 and 60 mm Hg respectively.

Which of the following statements (s) regarding the cardiac system is/are correct ? (i) Human heart is an ectodermal derivative (ii) Mitral valve guards the opening between the right atrium and left ventricle (iii) SAN is located on the left upper corner of the right atrium (iv) Stroke volume xx Heart rate = Cardiac output.

Given alongside is a diagram of the human heart showing its internal structure. Label the parts marked 1 to 6, and answer the following questions. Name the main artery which takes the blood from heart to different parts of the body.

The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow : Which part of the heart is contracting in this phase ? Give a reason to support your answer

Given alongside is a diagram of the human heart showing its internal structure. Label the parts marked 1 to 6, and answer the following questions. Which chamber of the heart receives deoxygenated blood from the body?

The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow : Draw well labelled diagrams of part 1 and 2 to show the structural differences between them.

Given alongside is a diagram of the human heart showing its internal structure. Label the parts marked 1 to 6, and answer the following questions. Which type of blood is carried by the blood vessel marked 2 ?

Read the following statements and select the correct ones (i) Nodal tissue is specialised cardiac musculature in human heart which has the ability to generate action potential due to an external stimuli (ii) Position of SAN - right corner of right atrium (iii) Position of AVN - right corner of ventricle (iv) AV bundle continues from AVN (v) Purkinje fibres are modified cardiac muscle fibres that originate from the atrioventricular node and spread into the two ventricles.