Complete the following sentences with appropriate words :
1. The sequence of one systole followed by one diastole is termed as the .........
2. The membranous covering of the heart is ...........
3. The heart is made up of special muscles, the .......... muscles.
4. The blood vessel that begins and ends in capillaries is the ..........
5. The blood vessel leaving the left ventricle of the mammalian heart is the ........