Question

When we lift a heavy object
A. triceps contracts and biceps relaxes
B. Biceps contract and triceps relaxes
C. Both biceps and triceps contracts
D. both biceps and triceps relax

Answer 1

Muscle tissue is soft and present along with bone to perform a mechanical activity, like pushing, pulling, lifting, and some other activity. Muscle cells contain actin and myosin protein filament, which slide and produce contraction that changes the length and shape of the cell.

Complete answer:
The muscle tissue arises from the mesodermal layer by myogenesis process, it is divided into three types of muscles, such as skeletal, cardiac, and smooth, and the action of muscle can be voluntary and involuntary. cardiac and smooth muscles are involuntary in action while skeletal muscles are voluntary in action, produce force and motion, the skeletal muscles divided into slow and fast-twitch fibres.
Muscles are mainly responsible for changing and maintaining the posture, locomotion and movement of an internal organ, like contraction of the heart and peristalsis movement of the digestive tract.
There are two groups of muscle sets which are involved in lifting, the biceps and triceps muscles when triceps muscle contract then biceps muscles relaxes that cause the straightens the arms when biceps muscle contract and triceps muscles relax then hand lift. The triceps muscle is not much powerful as the biceps and not able to exert as muscle force to straighten the arm, bicep muscle exert force to lift and straighten the arms.
Hence, the correct option is B.

Note: Skeletal muscles are voluntary in action and anchored by tendons to bones and help in effective movements such as maintaining a posture and locomotion. An average adult male possesses 42 percent of skeletal muscles and a female to have 36 percent.