Cyclic contractions of heart muscle are initiated by O a. chemical reactions.
O b. the level of oxygen in the blood.
O c. electrical impulses.
O d. physical exercise.

Which is an internal barrier to seeking with mental problems? a) lack of parent permission b)complex mental health system c) difficulty paying for servicesd) cultural and religious conflicts

Describe specific ways your friend can use frequency, intensity, time, and type to safely apply the overload principles to his workout schedule. provide two ways per training principle. sunday30-minute bike ride monday20 push-ups, 10 squats, and 20-minute jog tuesday30-minute bike ride wednesdayrest thursday20 push-ups, 10 squats, 25 curl-ups, and 20-minute jog friday30-minute bike ride saturdayone-hour walk

Describe two habits that can you move toward achieving your goals.