Which of These Factors Is the Major Determinant Influencing Resistance

question 221

Multiple Choice

Which of these factors is the major determinant influencing resistance to blood flow?

• A)viscosity of the blood
• B)radius of the vessel through which the blood is flowing
• C) pressure gradient in the vessel
• D) haematocrit of the blood

---

Definitions:

Acetylcholine

A chemical messenger that plays a significant role in muscle activity and memory retention.

Dopamine

A neurotransmitter in the brain that plays a key role in regulating mood, motivation, pleasure, and reward.

Endorphins

These are neurotransmitters produced in the brain that act as natural painkillers and are also associated with feelings of pleasure and well-being.

Serotonin

A neurotransmitter that contributes to feelings of well-being and happiness, also involved in regulating mood, appetite, and sleep.