Platelets are responsible for clotting as they cover a wound in order to prevent excessive bleeding and infections.
Answer:
S-T segment of ECG shows ventricles contraction.
Explanation:
The ECG is used to measure the electrical signals that controls the contraction and relaxation of heart, most commonly known as heart rhythm. S-T segments are the region after the QRS wave in ECG which is further followed by T waves. The S-T segment is generally shown as a straight line as no electrical signal pass through it and this is the time when ventricles contraction in the heart takes place.
Each box weighs the same but the bottom left truck has more boxes then the rest so it has more mass therefore more gravity acting on it.
