No they are a surface problem.
Absolutely
It can happen. There is a condotion known as BPH (Benign Prostate Hyperplasia) that can narrow the urethra and restrict urine flow. This can also occur with prostate cancer.
An enlargement of the prostate gland may restrict the flow of urine from the bladder. The prostate gland grows larger due to an increase in the number of cells, hyperplasia.
It restricts current flow
it increases blood flow. that's what gets you high.
restrict flow
If the Urine is in the bladder and does not flow, you put a catheter through the urethra.
A urine flow test evaluates the speed of urination, or amount voided per second, and the total time of urination.
Resistors are like funnels, they restrict the flow of current.
.
Resistance. Where as in an electrical circuit there are resistors that restrict the flow of electricity
A dam is built across a river to restrict the flow of water.
atherosclerosis