It would be helpful is you added the answer choices, but she could increase the intensity/work with more vigour to increase her heart rate.
Answer: Hope this help, I believe its D
Explanation:
Answer:
The circulatory system is divided into systemic circulation and pulmonary circulation.
Explanation:
Systemic circulation carries oxygenated blood from the left ventricle to the rest of the body while pulmonary circulation carries deoxygenated blood away from the right ventricle.
Your Answer Is...
It is a barrier to listening because if you're thinking of something else, than you're not paying attention to the person whose talking.
Glad I Could Help, And Good Luck!
My Brainly Name: AnonymousGiantsFan