Yes
Increase
The pulmonary arteries are responsible for carrying deoxygenated blood to the lungs so decreased flow would cause an increase in the amount of carbon dioxide in the blood, which in return can increase hydrogen ion concentration. This can produce acidosis of the blood.
No
Exercise, sexual arousal, and embarrassment can all cause increased blood flow to different parts of the body. Increased blood flow to the digestive organs happens after a meal.
pulmonary circulation the flow of blood from the right ventricle through the pulmonary artery to the lungs, where carbon dioxide is exchanged for oxygen, and back through the pulmonary vein to the left atrium.
Alveolar 02 concentrations rise and results in vasodilation of the pulmonary vessels to increase blood flow to match the airflow.
pulmonary embolism
Decreased pulmonary blood flow alone does not cause cyanosis. It is when decreased pulmonary blood flow is associated with right to left shunting (ie Tetralogy of fallot) that it is associated with cyanosis.
There is evidence that certain types of exercise and a rise in temperature of the area can increase blood flow in cutaneous circulation.
pulmonary circulation
lungs
no it actually stimulates blood flow