The function of the sinoatrial node is to
A. keep the heart beating.
B. filter lymph.
C. prevent blood from backing up into the atrium.
D. divide the right and left sides of the heart.
The sinoatrial node is also known as the pacemaker
of the heart because it sets the pace of the heart rate.
the answers confuse me. i think b not sure
To find the correct answer, let's break down the options and examine the function of the sinoatrial node (SA node) in more detail.
A. Keep the heart beating: This option is correct. The primary function of the sinoatrial node is to initiate and regulate the electrical impulses that begin each heartbeat. It acts as the natural pacemaker of the heart by setting the pace for the heart's contractions.
B. Filter lymph: This option is incorrect. The SA node is not involved in lymph filtration. Lymphatic vessels and lymph nodes are responsible for filtering lymph fluid.
C. Prevent blood from backing up into the atrium: This option is incorrect. The sinoatrial node's main function is not related to preventing blood flow issues or valve malfunctions within the atrium.
D. Divide the right and left sides of the heart: This option is incorrect. The SA node does not divide the right and left sides of the heart. The septum, or the muscular wall, divides the two sides.
Therefore, the correct answer is A. Keep the heart beating. The sinoatrial node initiates the electrical impulses that regulate the heartbeat, making it the pacemaker of the heart.