6 .
The diagram below represents a plant cell
Nucleus
R
$
(a) Name a carbohydrate which forms part of the structure labelled S
(6) State two functions of the part labelled R
(c) Name two structures present in the diagram but absent in the animal cell The​

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

List two modern organisms that have pentameral symmetry

How does the nervous system affect the excretory system?