How do the highlighted valve cusps function during a ventricular contraction?
1. They are pulled open by the chordae tendineae to allow blood to flow into the right ventricle.
2. vThey are held closed by the chordae tendineae to prevent blood from flowing back into the right atrium.
3. They are pushed open by the increasing blood pressure to allow blood to leave the right ventricle.
4. They are pushed closed by the papillary muscles to prevent blood from flowing back into the right atrium.

Some technological solutions to problems like global warming meet the specific needs and situations of local communities. an example from india involves converting the solid waste from cattle into clean-burning fuel for cooking. this reduces the amount of greenhouse gases, specifically methane and carbon dioxide, released into the environment from wood fires. when evaluating the feasibility of implementing this solution, computer models are used to weigh costs against benefits. what factor is least likely to impact the decision on adopting this technology?

Which muscle is responsible for inhalation ?

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms