Answer:
The correct answers are:
1. closing
2. the ventricles and arteries,
3. a constricted trachea
Lub is the first sound of a heartbeat and is mentioned as S1. It is usually produced due to the closing of tricuspid and and mitral or bicuspid valves present between atria and ventricles.
Tricupsid is located between atrium and ventricle of the right hand side and mitral valve is located between atrium and ventricle of the left hand side. They prevent the back flow of blood from ventricles to their respective atria.
Dub, being the second sound is written as S2. It is produced due to the closing of pulmonary (located between right ventricle and pulmonary artery) and aortic valves (located between left artery and aorta).
These valves prevent the back flow of blood from arteries into the ventricles.
The time between the two sounds is often taken as the measure of the diastole i.e. ventricular filling.
Wheezing refers to a high-pitched sound produced when a person breathes, especially during exhale. It is caused by constriction of the airways or inflammation. It is considered as a symptom of various diseases such as asthma, COPD, allergies, bronchitis etc.
Answer:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.
Explanation:
The statement that does not better protect the marine environment and organisms is disposing of all waste in a landfill. The correct answer is B.
Answer:
A. Hunting and killing the snakes on the farm
Explanation:
Snakes are naturally born predators and rodents such as rats and mice serve as their preys. Hence, their presence on the farm will limit the population of rodents in such farm.
<em>Therefore, hunting and killing all the snakes on the farm will allow rodent population to flourish, leading to a spike in their population.</em>
The correct option is A.
The answer is pronation. This happens at proximal radioulnar
joint in which movement is allowed. It is the movement seen most of the times
in the individual’s foot. It is where the heels move outward in position and
the foot is rolled.
