BIOLEAD WEEK 15 TRANSPORT SYSTEM

Which of the following stages of cardiac cycle would be affected first if the nerve fibers within bundle of His were cut

• diastole

• atrial systole

• ventricular systole

• stimulation of the AV node

Which of the following statements about the lymph vascular system is NOT true? The lymph vascular system...

• recovers and transport interstitial fluid back to bloodstream

• absorb glucose from the small intestine and transport to the brain

• transport lipids absorbed from small intestine to the bloodstream

• serve the body system of the defense againts bacteria and other infectious agents

Figure shows the pathway for movement of water into xylem root. Which of the pathway is prevented by Casparian strip in endodermis

• A & B pathway

• B & C pathway

• A & C pathway

• A, B & C pathway

The pressure flow model for phloem translocation states..

• that sink strength drives transport in the phloem

• that transport in treachery elements is pressure dependent

• the water potential gradient in the sieves elements drives transport

• the pressure gradient between the sieves elements at the source and the sink drives phloem transport

The graph shows the pressure of the right side of a mammalian heart during a cardiac cycle. Which events occur at X?                                                            

• Atrium contracts, blood flows into the ventricle

• Ventricle begins to contract, atrioventricular valve close, pulmonary valves remain closed

• Pulmonary valves are forced open, blood flows from ventricle into pulmonary artery

• Pulmonary valves close, ventricular volume begins to increase

Which theory of water transport states that hydrogen bonding allows water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?

• Fusion

• Evaporation

• Pressure flow

• Cohesion-tension

With reference to the graph, which label refer to the opening of atrioventricular valve

• E

• F

• G

• H

the endodermis with its Casparian strips

• carries out active transport

• facilitates root pressure

• ensure water and minerals enter the xylem via the apoplastic pathway

• controls and regulates the mineral ions that enter the xylem

Which of the following causes the first sound after atrial systole in the cardiac cycle

• Opening of the atrioventricular valves

• Closing of the atrioventricular valves

• Opening of the semilunar valves

• Closing of the semilunar valves

Which statement about transport in plants is NOT true

• The high root pressure will cause transpiration pull

• The Casparian strip forms a barrier that forces water to pass by the symplastic pathway

• When the root pressure is very high, it forces water into the leaves and cause guttation

• In the apoplastic pathway, water diffuse into the roots between the walls of the root epidermal cells