(a) Sleep is a natural phenomenon needed for rest and rebuilding of mind and body after the day’s work. Sound sleep is essential for optimal performance. Many important functions of the body takes place during our sleep hours. 

(b) Arteriosclerosis is defined as stiffening lor hardening of the arterial walls. As the arterial walls harden, the heart has to pump harder and against resistance to enable the arterial blood reach all the peripheral Organs. 

(c) Posture means carriage or the manner holding one’s body while sitting, standing, walking and lying. 

The correct posture while standing is: 

1. Body should be straight in upright position. 

2. Body’s weight should be distributed equally on both the feets. 

3. Heels and feet should be joined. 

4. Toes should be 18 inches apart with knees straight. 

5. Neck straight with chin forward and tight. 

6. The belly must be backward with chest forward. 

(d) Three symptoms of tuberculosis are: 

1. Coughing blood. 

2. The lymph nodes near the heart and lungs also become enlarged. 

3. Loss of appetite.