Physiology Online Retrieval

What is the main function of osteoblasts?

• To break down old and damaged bone.

• To form new bone.

• To direct the osteoclasts to the damaged bone.

What is the main function of osteoclasts?

• Break down old and damaged bone.

• To form new bone.

• To direct the bone cells to the damaged area.

Which activity would be better for the skeletal system?

Aqua aerobics or hockey training?

• Aqua Aerobics

• Hockey Training

Reorder the following for weight-bearing activities on the skeletal system.

• The participant is less likely to suffer from diseases such as osteoporosis

• Then osteoblasts will form new bone.

• This stimulates the release of osteoclasts to break down the old and damaged bone.

• Weight-bearing activities place stress/pressure on the bone.

• This increases the bone density and the bone gets stronger.

Why is the synovial fluid important when exercise occurs?

• Acts as a shock absorber.

• Facilitates smooth movement.

• Acts as a lubricant

• Reduces the chance of injury.

What is required for an explain question?

• Give a full account of the information, with all the relevant details.

• Give a definition or example.

• Providing a point to convey an understanding and providing a justification/expansion.

Which characteristic would describe a type IIx muscle fibre?

• Has the characteristics of the other two muscle fibres.

• Fast contraction speed and high force production.

• Rich in Mitochondria.

• Smallest in size.

What happens to the arteries towards the working muscles during exercise.

• They stay the same.

• They vasoconstrict.

• They vasodilate.

An increase in muscle temperature can increase muscle pliability. What is pliability?

• When the arteries increase the rate of vasodilation.

• When the muscle fibres have microscopic damage.

• When the synovial membrane secretes more synovial fluid.

• When muscles become more flexible, easily stretched, and moulded without tearing.

What is it called when a muscle is in complete sustained contraction due to rapid stimulation.

• Twitch

• Tetanus

• Wave summation

• Motor neuron