Human Circulatory System

Q.

Identify the icons labelled 1 - 6 in the sequence of blood circulation

1. 1- Right atrium 2- Right ventricle 3- Pulmonary artery 4- Lungs 5- Left atrium 6-Left ventricle

2. 1- Left ventricle 2- Left atrium 3- Pulmonary artery 4- Right atrium 5- Right ventricle 6- Lungs

3. 1- Lungs 2- Right atrium 3- Pulmonary artery 4- Right ventricle 5- Lungs 6- Right atrium

4. 1- Right atrium 2- Pulmonary artery 3- Right ventricle 4- Lungs 5- Right atrium 6- Lungs

Q.

Which of these statements is NOT true about the heart?

1. The heart is situated between the two lungs in the mediastinum.

2. The heart is a pear shaped hollow organ.

3. The apex of the heart always rests on the diaphragm.

4. The heart develops from the ectoderm.

Q.

Which blood vessel wall layer is correctly matched with the description about its tissue structure?

1. Tunica externa (adventitia) - consists of smooth muscle tissue

2. Tunica interna (intima) - consists of only a thin layer of connective tissue

3. Tunica media - consists of simple squamous epithelium

4. Tunica media - consists of smooth muscle and elastic connective tissue, the amounts and proportions of each depending on vessel type