Answer:
Weathering
Explanation:
Process where rock is dissolved, worn away or broken down into smaller pieces.
Answer is: platelet plug
When platelets stick to each other and to the blood
vessel they form a plug in the hole of the vessel. This process is called platelet aggregation.
Before the plug forms, a platelet will stick to the blood vessel (adhesion), change its shape
and signal other platelets to come help (activation and secretion). Then they
stick to each other (aggregation).
Answer:
All three statements are correct.
Explanation:
Glycolysis may be defined as a biochemical pathway used to obtain energy by the oxidation of glucose molecule. Gluconeogenesis may be defined as the metabolic pathway of generation of glucose from the non carbohydrate source.
These two process are not reverse of each other since all enzymes are not the same for both the pathway. The ATP levels decide the which pathway starts at the specific condition. The substrate cycle are used in gluconeogenesis and glycolysis pathway.
Thus, the correct answer is option (4).
And: Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. Some molecules and ions such as glucose, sodium ions, and chloride ions are unable to pass through the phospholipid bilayer of cell membranes.
Answer:
E. All of the above
Explanation:
In cardiac contractile cells there is rapid depolarization, then a plateau phase and repolarization.
when an action potential stimulates the cell, voltage-gated channels open quickly commencing the positive-feedback mechanism of depolarization. This in turn raises the membrane potential to approximately +30 mV, and this closes the sodium channels. Next comes the plateau phase, where membrane potential declines relatively slowly due to the opening of the slow Ca2+ channels, allowing Ca2+ to enter the cell while few K+ channels are open, leading to K+ to exit. Once the membrane potential reaches approximately zero, the Ca2+ channels close and K+ channels open, allowing the exit of K+. The repolarization lasts approximately for a while and here is when the membrane potential drops until it reaches resting levels once more and repeats the cycle.
