APoE Quiz 4

"During low-intensity exercise, which of the following mechanisms are responsible for decreases in heart rate?"

Increases in stroke volume

Which of the following myocardial cells is the major pacemaker cell of the heart?

Sinoatrial node

"Accumulation of metabolic by-products in muscle (H+, CO2, heat) leads to"

 

Vasodilation

"Compared to untrained individuals, trained endurance athletes have"

Higher maximal stroke volumes

"If you are working with an elite endurance athelte, which of the following resting heart rates would you expect to see?"

40 bpm

Which of these systolic pressures would realistically be seen at maximal endurance exercise?

200 mmHg

Blood will not flow out of the left ventricle and into the Aorta UNTIL

Ventricular pressure exceeds aortic pressure

The pulmonary veins travel from the __________ to the __________.

"lungs, left atrium"

"If dehydration causes hematocrit to rise to 60%, what is the consequence?"

Diminished exercise capacity due to impeded blood flow

Plasma is composed primarily of _______________.

Water