Related questions
Question
A 1 cm long section of a blood vessel has a constriction that reduces the inner diameter from 4 mm at the entrance to 2 mm at the exit. Ignore the effect of gravity and assume that viscosity is negligible. Compared to the pressure at the entrance the pressure at the exit is:
Group of answer choices
lower
higher or lower depending on blood mass density
higher
higher or lower depending on the flow rate
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 2 steps with 2 images
Knowledge Booster
Similar questions
- There is a maximum depth at which a diver can breathe through a snorkel tube because as the depth increases, so does the pressure difference, which tends to collapse the diver’s lungs. Since the snorkel connects the air in the lungs to the atmosphere at the surface, the pressure inside the lungs is atmospheric pressure. What is the external–internal pressure difference when the diver’s lungs are at a depth of 6.1 m (about 20 ft)? Assume that the diver is in freshwater. (A scuba diver breathing from compressed air tanks can operate at greater depths than can a snorkeler, since the pressure of the air inside the scuba diver’s lungs increases to match the external pressure of the water.)arrow_forwardAt a given instant, the blood pressure in the heart is 1.6x104 Pa. If an artery in the brain is 0.45 m above the heart, what is the pressure in the artery? Ignore any pressure changes due to blood flow.arrow_forwardAt a given instant, the blood pressure in the heart is 1.4 x 104 Pa. If an artery in the brain is 0.37 m above the heart, what is the pressure in the artery? Ignore any pressure changes due to blood flow.arrow_forward
- A 1.50 mL syringe has an inner diameter of 5.50 mm, a needle inner diameter of 0.230 mm, and a plunger pad diameter (where you place your finger) of 1.2 cm. A nurse uses the syringe to inject medicine into a patient whose blood pressure is 140/100. What is the minimum force the nurse needs to apply to the syringe? The nurse empties the syringe in 2.10 s. What is the flow speed of the medicine through the needle?arrow_forwardAn ambu (artificial manual breathing unit) device is connected to a patient. Ambu and lungs of the patient are formed a closed system. The pressure value of the closed system PI = 755mmHg, the initial volume of lungs is VL=5L. The initial volume of ambu is VA=1L. Ambu is manually controlled and when it is squeezed to 50% of its initial volume the lungs volume is increased by AV. AV= 582 mL. What will be pressure value (in terms of mmHg) of the closed system after the ambu is squeezed? (PS=?)arrow_forwardA box has a length of 1.3 cm, a width of 6.4 cm, and a height of 3.2 cm. Its mass is 9.8 kg. The box sits at rest on a horizontal floor. What is the pressure of the box on the floor?arrow_forward
- Under normal circumstances, the vitreous humor, a jelly-like substance in the main part of the eye, exerts a pressure of up to 24 mmmm of mercury that maintains the shape of the eye. If blockage of the drainage duct for aqueous humor causes this pressure to increase to about 50 mm of mercury, the condition is called glaucoma. What is the increase in the total force (in newtons) on the walls of the eye if the pressure increases from 24 mm to 50 mm of mercury? We can quite accurately model the eye as a sphere 2.2 cm in diameter. Express your answer in newtons.arrow_forwardThe average body density of a human is 1030 kg/m3, yet we typically float in seawater when we fill our lungs with air and sink when we exhale. Therefore, our effective density is similar to that of seawater, 1010 kg/m3. If the typical total volume (body density + lung capacity) of a human is 0.25 m3, what volume is due to body mass and what volume is due to lung capacity (you can assume the density of air is rair = 1.2 kg/m3)arrow_forwardAt a given instant, the blood pressure in the heart is 1.7 x 104 Pa. If an artery in the brain is 0.46 m above the heart, what is the pressure in the artery? Ignore any pressure changes due to blood flow.arrow_forward
- The pulmonary artery, which provides a horizontal connection between the heart and the lungs, is 8.4 cm long and has an inner radius of 2.6 mm. Blood within the heart is basically at rest. The density of blood is 1050 kg/m3, a little greater than the density of water. If the pressure drop between the heart and lungs is 400 Pa, what is the speed of blood in the pulmonary artery?arrow_forwardA sphygmomanometer is a device used to measure blood pressure, typically consisting of an inflatable cuff and a manometer used to measure air pressure in the cuff. In a mercury sphygmomanometer, blood pressure is related to the difference in helghts between two columns of mercury. The mercury sphygmomanometer shown in the figure below contains air at the cuff pressure P. Po The difference in mercury heights between the left tube and the right tube is h= 109 mmtg - 0.109 m, a normal systolic reading. What is the gauge systolic blood pressure Poauge in pascals? The density of mercury is p 13.6 x 10 kg/m and the ambient pressure is Po1.01 x 10 Pa. HINT Paarrow_forwardA scuba diver is in fresh water has an air tank with a volume of 0.0100 m3. The air in the tank is initially at a pressure of 1.00 × 107 Pa. Assume that the diver breathes 0.500 L/s of air. Density of fresh water is 1.00 × 103 kg/m3. How long will the tank last at depths of 4.10 m?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios