Answer Options Description/Definition This mechanism helps get blood back to the

Question

Answer Options Description/Definition This mechanism helps get blood back to the heart through rhythmic skeletal muscle contraction and relaxation cycles. Cardiac output Concentration gradient 1. 2. This mechanism uses alternating pressure changes in the thoracic and 2 Heart rate abdominal cavities to help get blood back to the heart. Muscle pump 3. This narrowing of the diameter of the veins' lumen helps blood return 3. Pressure to the heart. gradient The smooth muscle of the arterioles is the primary effector for this 4.0? tine 4. Resistance reststAne major factor affecting blood pressure. Respiratory pump 5. The conducting cells of the sinoatrial node are the effectors for this5 measure. Stroke volume 6. Total blood volume 6. The left ventricular contractile cells are the effectors for this measure. Total peripheral resistance Venoconstriction Venous return

Explanation / Answer

1. Muscle pump: Muscle pump is a group of skeletal muscles that contract and relax and enhances the venous return to the heart.

2. Respiratory pump: Respiratory pump helps get blood back to the left atrium from lungs through pulmonary vein.  

3. Vasoconstriction: Narrowing of veins increases the blood preesure in the vein and thus help to enhance venous return to the heart.

4. Total peripheral resistance: Peripheral resistance is the resistance of the arteries to blood flow.

5. Heart rate: Heart rate is the number of heart contraction per minute.

6. Stroke volume: Stroke volume is the volume of blood pumped from the left ventricle per beat.

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