(D) In the heart of a frog, the $Sinus$ $\text{venosus}$ is a thin-walled, triangular chamber that receives deoxygenated blood from the venae cavae.It

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(D) In the heart of a frog, the $Sinus$ $\text{venosus}$ is a thin-walled, triangular chamber that receives deoxygenated blood from the venae cavae.It acts as the pacemaker of the frog's heart because it initiates the heartbeat.Therefore, the correct option is $D$.