nursing_student119

i tried to PM you but it wont let me. are you going to put B for the vein/valve question or just C? I thought blood flow slowed in veins so thats why they had valves... ahh confusing

thank you soo much!! :redbeathe for this question, it says "select all that apply" which makes me think there's more than 1 answer? so b could be an answer too? since it's not a or d

someone please help, I've searched all my books and the internet and I'm still confused! Which rationale describes why the cusp valves are different from the valves at the pulmonary artery and aorta? Select all that apply. A- Chordi tendoni are needed to prevent back flow of blood into the atria due to the level of pressure occurring during ventricular contraction B- Cusp valves prevent back flow of blood by closing after "forward" pressure reduces during diastole C- Valves are needed to keep blood flowing from low pressure to high pressure vessels attached to the heart D- Valves are different because of the kind of blood that passes through their openings Is it A and B?? Why do veins have valves when arteries don't? Select all that apply A- Because blood flow accelerates in the venous system B- Because blood flow slows in the venous system C- To prevent back flow of blood as venous walls don't have smooth muscle like arteries D- To prevent blood clots from developing in the lower extremities I know it's B and C, but could D work too? Which is the best explanation of why fetal heart rate is 120-160 beats per minute? A- The smaller the mammal, the faster the heart beat B- The fetus exists in a reduced oxygen level in the uterus, so the heart rate increases to meet oxygen demand C- The conduction system of the heart is immature; therefore it is more prone to a faster rate than an adult D- Because the fetus doesn't "breathe" in the uterus, its heart rate stabilizes to circulate blood D??