Answer:
A. Equal to cardiac output
Explanation:
Venous return refers to the rate at which blood flows back to the heart.
Averaged over a few heartbeats and over steady state conditions, venous return is equal to cardiac output. This is because the cardiovascular system is a closed loop made up of the pulmonary and systemic circulations.
The reason why the venous return must equal cardiac output is to avoid the accumulation of blood in one of the two circulations in the cardiovascular system.
Some of the mechanisms for venous return include;
1.) Exercise
2.) Gravity
3.) Thoracic pump and
4.) Pressure Gradient
5.) Skeletal muscle pump
#19
Polar nuclei fuse to produce Diploid secondary nucleus.
#20
After fertilisation the antipodal cells undergo meosis
#21
In which of the following double fertilisation occurs.
Ans:- Angiosperm s
#22..
In angiosperms pollen grains germinate on the Anther.
Answer:
because it's a sediment made up of very small
Explanation:
Answer:
Yes
Explanation:
Hormone is responsible to mediate change in the cell by binding to the hormonal receptor present on the cell. So hormone only acts on the cells which have the specific receptor for that hormone.
One cell can have many receptors for a single hormone which defines the sensitivity of cell for the hormone which is responsible for generating appropriated cellular response in the cell.
So the number of receptors on the cell can contribute to different responses of cells having the same hormonal receptor. Every cell also have unique transduction pathway which is also responsible for different response of cell.