Which of these statements regarding the “oxygen debt” created during heavy exercise is true?

Oxygen debt is created due to build-up of acetic acid in the muscles, which needs a high level of oxygen to be oxidized.
Oxygen debt is created due to build-up of lactic acid in the muscles, which needs a high level of oxygen to be oxidized.
Oxygen debt is created due to build-up of lactic acid in the liver, which needs a high level of oxygen to be stored.
Oxygen debt is created due to build-up of lactic acid in the muscles, which needs a high level of carbon dioxide to be oxidized.

Answer(s): B

Which of these statements regarding facilitated diffusion across a cell membrane is true?

It is a kind of active transport (i.e., does directly use energy such as hydrolysis of ATP) that requires protein pumps.
It is a kind of passive transport (i.e., does not directly use energy such as hydrolysis of ATP) that does not require transmembrane/carrier proteins.
It is a kind of passive transport (i.e., does not directly use energy such as hydrolysis of ATP) that requires transmembrane/carrier proteins.
It is a kind of active transport (i.e., does directly use energy such as hydrolysis of ATP) that requires transmembrane/carrier proteins.

Answer(s): C

Phalanges are bones present in which parts of the body?

Answer(s): A

Which statement regarding ball and socket joints is true?

Ball and socket joints are multi-axial joints, which are highly mobile, allowing movement in multiple axes and planes.
Ball and socket joints are uni-axial joints, which are highly mobile, allowing rotation around a central axis.
Ball and socket joints are bi-axial joints, which are mobile, allowing movement in two planes.
Ball and socket joints are uni-axial joints, which are mobile, allowing movement in a single axis and plane.

Answer(s): A

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